Grade 9 Science Worksheets

Learning Objectives

• Describe Earth’s main concentric layers and how density, temperature, and pressure change with depth.
• Explain the mechanical differences between the lithosphere and the asthenosphere.
• Use evidence from seismic waves and gravity to infer Earth’s internal structure.+ Show more

Learning Objectives

• Understand the four main types of chemical reactions: synthesis, decomposition, single displacement, double displacement, and combustion.
• Identify reactants and products in synthesis reactions.
• Differentiate between various reaction patterns based on reactants and products.

Learning Objectives

• Understand the types and propagation characteristics of seismic waves.
• Learn how earthquake focal mechanisms reveal fault types and stress orientations.
• Relate seismic wave travel times to Earth's interior models and methods for locating epicentres.+ Show more

Learning Objectives

• Distinguish between series and parallel circuit arrangements using current and voltage behavior
• Predict how changes in components affect current, voltage, and brightness in series vs. parallel circuits
• Use basic reasoning to evaluate reliability and load distribution in real-world circuit choices

Learning Objectives

• Understand the fundamental principles of redox reactions and electron transfer.
• Identify oxidation and reduction processes and their changes in oxidation states.
• Learn to track oxidation states to determine oxidizing and reducing agents.+ Show more

Learning Objectives

• Understand how electrons are distributed among energy levels and orbitals in atoms.
• Identify the role of valence electrons in chemical reactivity and bonding.
• Describe the shell filling order and its impact on periodic trends.+ Show more

Learning Objectives

• Identify the parts of an atom (protons, neutrons, and electrons) and their locations.
• Explain how atomic number and mass number determine an element and its isotope.
• Describe how a simple electron-shell model helps explain basic chemical behavior.

Learning Objectives

• Identify the six classical simple machines and explain how each can change force and/or direction
• Use ideal mechanical advantage relationships to connect input force with output force and displacement
• Explain real-world limits (friction and deformation) and how they affect mechanical advantage

Learning Objectives

• Explain how Earth’s water cycle moves matter and energy among reservoirs such as oceans, clouds, land, groundwater, and ice
• Describe how carbon moves among the atmosphere, living things, oceans, and rocks through processes like photosynthesis and respiration
• Connect incoming solar radiation and outgoing Earth radiation balance to temperature and weather patterns

Learning Objectives

• Explain how eccentricity, axial tilt, and precession change seasonal insolation and long-term climate patterns
• Describe tidal forcing from the Moon and Sun using ideas of gravitational gradients and relative geometry
• Evaluate how resonance and tidal locking can alter rotation, day length, and tidal range

Learning Objectives

• Identify and describe how the six classical simple machines change force and/or direction of motion.
• Use the idea of ideal mechanical advantage to relate input force, output force, and displacement.
• Explain practical limits (friction, deformation) and how they affect real machines compared with ideal predictions.

Learning Objectives

• Understand the basic properties of waves including frequency, wavelength, and amplitude.
• Learn how changes in wave parameters affect the characteristics of signals.
• Translate between different wave representations using wave parameters.+ Show more

Learning Objectives

• Explain how enzymes lower activation energy and increase reaction rates
• Describe how enzyme structure and active sites create substrate specificity
• Use the ideas of cofactors, induced fit, and thermodynamic favorability to interpret enzyme reactions

Learning Objectives

• Identify the main idea about how multiple evidence types support evolutionary inference.
• Describe how fossils, anatomy, and molecular data contribute to explanations of descent with modification.

Learning Objectives

• Explain how the plasma membrane controls the movement of substances using selective permeability
• Differentiate between passive transport (diffusion and osmosis) and active transport
• Describe how membrane proteins (channels, pumps, and receptors) enable specific transport and cell communication+ Show more

Learning Objectives

• Identify the main pathways of the nervous and endocrine systems
• Differentiate between rapid neural responses and slower hormonal responses
• Explain how both systems work together to maintain body homeostasis

Learning Objectives

• Understand how to interpret various types of graphs such as scatterplots, histograms, and line graphs.
• Learn to construct clear and accurate graphical representations of data.
• Identify patterns, outliers, and trends in graphs to inform model selection.+ Show more

Learning Objectives

• Interpret scientific evidence linking dietary choices to cellular and system-level health outcomes.
• Identify mechanisms by which nutrition influences chronic health conditions.
• Analyze epidemiological data to distinguish correlation from causation in health studies.+ Show more

Learning Objectives

• Explain the law of conservation of mass in closed chemical reactions using the idea of conserved atoms
• Use mass-conservation reasoning to interpret evidence from sealed systems (e.g., combustion and captured gas)
• Apply conservation of mass to simple particle and measurement scenarios

Learning Objectives

• Describe the main processes and inputs of photosynthesis.
• Identify the components and stages involved in converting light energy into chemical energy.
• Explain the role of pigments, water oxidation, and the production of ATP and NADPH.+ Show more

Learning Objectives

• Differentiate between heterogeneous mixtures and homogeneous solutions based on uniformity and separability.
• Identify key concepts such as solute, solvent, and concentration.
• Describe methods of separating components of mixtures based on physical properties.+ Show more

Learning Objectives

• Explain how disturbances can change ecosystem stability through altered species interactions and environmental conditions
• Describe how resilience, recovery rate, and ecological thresholds influence whether an ecosystem returns to its prior state
• Use long-term population and community data to distinguish gradual change from rapid ecosystem shifts+ Show more

Learning Objectives

• Understand how unbalanced forces cause changes in motion.
• Distinguish between balanced and unbalanced forces.
• Explain how net force direction relates to acceleration and motion.+ Show more

Learning Objectives

• Describe the structure of the kidneys and nephron.
• Explain how blood is filtered in the glomerulus.
• Identify the process of reabsorption and secretion in the nephron.+ Show more

Learning Objectives

• Understand the basic differences between prokaryotic and eukaryotic cells
• Identify features unique to bacterial and archaeal cells
• Describe cellular structures such as DNA, cell walls, and ribosomes in prokaryotes+ Show more

Learning Objectives

• Distinguish the roles of mitosis and meiosis in growth, tissue repair, and reproduction
• Explain key events in meiosis, including chromosome pairing, recombination, and segregation
• Identify consequences of chromosome segregation errors such as nondisjunction+ Show more

Learning Objectives

• Explain how scientific arguments connect evidence to reasoning to evaluate a claim
• Identify how uncertainty, bias, and alternative interpretations affect the strength of a claim
• Use evidence patterns (trends, comparisons, and replication) to support or weaken explanations

Learning Objectives

• Understand the mechanical and chemical processes involved in digestion
• Identify the structure and function of villi and microvilli in nutrient absorption
• Describe the role of enzymes, bile, and transport mechanisms in nutrient uptake+ Show more

Learning Objectives

• Explain how measurements and quantitative data support or constrain scientific claims.
• Describe how models summarize patterns and relate variables in explanations of motion and energy transfer.
• Evaluate competing explanations by comparing predictions to evidence and by checking stated assumptions.+ Show more

Learning Objectives

• Identify evidence that a chemical reaction occurred by observing new substances forming
• Differentiate types of reactions by using reaction terms and common examples
• Interpret reactants and products in a simple symbolic equation+ Show more

Learning Objectives

• Explain key principles of metric measurement, including units, instrument resolution, and calibration.
• Use consistent measurement protocols to improve data quality and comparability.
• Represent measurements accurately in tables and graphs while accounting for uncertainty.

Learning Objectives

• Compare physical and chemical changes using energy transfer between a system and its surroundings.
• Explain endothermic and exothermic behavior based on temperature changes and direction of energy flow.
• Predict how energy transfer affects particle motion and arrangement during phase changes.+ Show more

Learning Objectives

• Distinguish primary succession from secondary succession and explain what triggers each type.
• Explain how species turnover and resource availability can change habitat conditions over time.
• Use ecological succession concepts to interpret how disturbance regimes and species traits influence long-term ecosystem trajectories.

Learning Objectives

• Explain how alleles form genotypes and how genotypes determine phenotypes using dominant and recessive relationships
• Use genotype–phenotype reasoning to predict inheritance outcomes across generations
• Interpret heredity evidence (such as ratios and pedigrees) to support conclusions about dominant vs. recessive traits

Learning Objectives

• Understand how to represent and analyze temporally changing systems using time-series data.
• Identify the role of feedback loops, rates, and equilibrium concepts in dynamic systems.
• Interpret empirical data to discern transient versus steady-state behaviors.+ Show more

Learning Objectives

• Explain how particle arrangement and electrical forces influence bulk properties of solids.
• Compare ionic lattices, covalent networks, and molecular solids using evidence from melting point, conductivity, hardness, and solubility.
• Use particle-level reasoning to predict changes in behavior when a solid is heated or dissolved.

Learning Objectives

• Distinguish physical changes from chemical changes using evidence of new substances.
• Explain how melting, freezing, and crushing can change phase or form without changing the substances present.
• Use conservation of identity language to describe what happens to a material during a physical change.

Learning Objectives

• Explain how appropriate units, calibrated instruments, and consistent recording affect measurement accuracy.
• Use significant figures to reflect the precision justified by a measuring device and method.
• Convert between common units and determine reasonable uncertainty ranges for fair comparisons.

Learning Objectives

• Define control criteria used in causal inference, including variable isolation, replication, and baseline characterization.
• Explain how appropriate reference conditions and counterfactuals strengthen causal interpretations.
• Identify how residual confounding and uncontrolled variation weaken causal claims, even when patterns appear.+ Show more

Learning Objectives

• Explain the mechanisms of plate tectonics, including divergent, convergent, and transform boundaries.
• Describe the processes of subduction and continental collision and their surface expressions.
• Link mantle convection and slab pull to the movement of lithospheric plates and their geological consequences.+ Show more

Learning Objectives

• Explain how the structure of DNA relates to how genetic information is copied and transmitted
• Describe how chromosomes, gene loci, and karyotypes help scientists organize genetic information
• Compare nuclear genomes with organelle genomes and predict how this can affect inheritance+ Show more

Learning Objectives

• Differentiate ionic, covalent, and metallic bonding based on electron behavior
• Connect bond type to observable properties such as melting point, conductivity, and solubility
• Use bond type vocabulary to explain why materials behave the way they do

Learning Objectives

• Explain how carbon records from ice cores, marine sediments, and terrestrial proxies can reconstruct past atmospheric and carbon-cycle changes.
• Interpret how isotopes, gas ratios, and carbon flux evidence can be linked to temperature variations over time.
• Distinguish natural variability from recent anthropogenic increases using multiple lines of proxy and instrumental evidence.

Learning Objectives

• Explain how allosteric control, inhibition (competitive and noncompetitive), and covalent modification regulate enzyme activity.
• Describe how environmental factors (temperature and pH) influence enzyme conformation and reaction rate.
• Evaluate how feedback inhibition and gene expression changes help maintain metabolic balance.

Learning Objectives

• Explain how mechanical systems transfer energy through work, collisions, and friction.
• Describe how energy converts between kinetic, potential, and thermal forms in systems.
• Identify examples of energy transfer, such as braking a bicycle or compressing a spring.+ Show more

Learning Objectives

• Use constant-acceleration kinematic equations to relate displacement, time, initial and final velocity, and acceleration.
• Apply the equations to vertical free-fall and horizontal/projectile motion using correct sign conventions for direction.
• Solve for unknown variables by choosing the appropriate kinematic form and substituting values consistently.

Learning Objectives

• Explain how the heart and lungs work together to supply oxygen and remove carbon dioxide.
• Identify the roles of pulmonary ventilation and cardiovascular transport in maintaining homeostasis.
• Describe how chemoreceptors regulate respiratory and circulatory responses to blood gas levels.+ Show more

Learning Objectives

• Explain how melting, crystallization, weathering, erosion, deposition, and metamorphism connect to form the rock cycle.
• Describe how energy sources and relative rates influence transitions in the rock cycle.
• Use observable field evidence (foliation, sedimentary layering, igneous intrusions) to identify rock-cycle processes.