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12 Cards in this Set

  • Front
  • Back
liquid rock outside of the earth
lava
to slowly break down or rot
decay
the decayed remains of plants and animals
humus
tightly packed soil with tiny grains
clay
rocks that are changed by heat, time or pressure
metamorphic
the outermost layer of the earth
crust
made when rocks break down and mix with water, air and humus
soil
rocks that are formed when magma cools and hardens
igneous
a mixture of sand, clay and humus
loam
rocks that are formed when layers of materials are pressed together for many years
sedimentary
materials that are not alive ,are not plants or animals, and are found in soil, rocks and water
minerals
soil with large grains that does not hold sand well
sand