1. Heat
2. Pollution 3. Habitats 4. Rocks and soils 5. Fossils 6. Magnets |
heat, temperature, friction, vapor, radiation, conduction, convection, thermal conductivity
pollution, pollutant, litter, air pollution, land pollution, water pollution, environment, acid rain, green house effect, conservation, reuse, reduce, recycle, natural resources habitat, adaptation, fresh water, salt water, forest, tropical rain forest, desert, ocean, lake, pond, wetland, polar region, food chain, food web, predator, prey, hibernate,camouflage, migrate, endangered, extinct rock, mineral, rock cycle, igneous, sedimentary, metamorphic, magma, lava, crust, mantle, core, weathering, erosion, volcano, earthquake, sediment, deposit, streak, hardness, soil, loam, sand, clay, silt, top soil, bedrock, humus fossil, mold, cast, trace fossil, fossil fuel, petrified fossil, petrification, magnet, poles, like poles, unlike poles, north pole, south pole, force, attract, repel, magnetism, magnetic, magnetic field, iron, permanent magnet, temporary magnet, gravity |