separate, measure, constant, evidence, identify, explain, transform, trace, quantity, boundary, apply, conclude, transfer, describe, compare, relationship, direction, represent, design, analyze, hypothesis, convert, present, construct, predict, observe, effect, investigate, record, cycle, model, impact, interpret, plan, implement, data, rate, pattern, influence, layer, variation, position, cyclical, relative, demonstrate, illustrate, cause, region, support, interact, depend, flow, factor

hydrologic cycle, hydrosphere, atmosphere, lithosphere, biosphere, spheres of Earth, evaporation, condensation, precipitation, transpiration, sublimation, infiltration, runoff, ground water, surface water, aquifer, porosity, permeability, watershed, topography, elevation, contamination, climate, current, density, salinity, Coriolis effect, global winds, jet stream, Gulf Stream, gyre, upwelling, El Niño, sea breeze, latitude, troposphere, stratosphere, mesosphere, thermosphere, exosphere, ozone layer, tropopause, altitude, air pressure, barometer, composition, nitrogen, oxygen, carbon dioxide, greenhouse gas, greenhouse effect, weather, ultraviolet light, orbit, revolution, rotation, gravitational force, moon phase, waxing, waning, new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, waning crescent, solar eclipse, lunar eclipse, umbra, penumbra, tide, spring tide, neap tide, axis, tilt, season, hemisphere, solstice, equinox, direct rays, monsoon, indirect rays, equator, daylight, angle, intensity

producer, consumer, primary consumer, secondary consumer, tertiary consumer, decomposer, herbivore, carnivore, omnivore, food chain, food web, energy pyramid, photosynthesis, cellular respiration, trophic level, nutrient, carbon cycle, matter, ecosystem, biome, biotic factor, abiotic factor, population, community, habitat, carrying capacity, limiting factor, biodiversity, succession, parasite, tundra, taiga, desert, grassland, temperate forest, tropical rain forest, aquatic biome

atom, element, compound, molecule, mixture, solution, suspension, colloid, dissolve, physical change, chemical change, chemical reaction, reactant, product, chemical equation, conservation of mass, closed system, open system, mass, volume, system, isolated system, kinetic energy, potential energy, gravitational potential energy, thermal energy, sound energy, energy transfer, energy transformation, conservation of energy, friction, dissipated energy, surroundings, wave, vibration, medium, vacuum, mechanical wave, electromagnetic wave, transverse wave, longitudinal wave, compression, rarefaction, crest, trough, wavelength, amplitude, frequency, wave speed, pitch, reflection, refraction, absorption, work, force, distance, mechanical energy, elastic potential energy, chemical potential energy, electrical potential energy, reference point, electrical energy, generator, electric motor, electric circuit, energy source, battery, switch, electric charge, closed circuit, open circuit, series circuit, parallel circuit, electric current, voltage, resistance, conductor, insulator, ammeter, voltmeter, light bulb, heat, temperature, particle, conduction, convection, convection current, radiation, thermal equilibrium, fluid, absorb, solar energy