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17 terms

3rd grade Unit 2 Science - Rocks, Minerals, and Fossils

STUDY
PLAY
rocks
anything made out of minerals
minerals
anything that is a solid, was formed in nature, and was never alive
igneous rock
a rock once melted, but cooled and hardened
metamorphic rock
any type of rock changed by heat and pressure
sedimentary rock
a rock that forms from material that is settled into layers
rock cycle
process of rocks changing into other types of rocks
fossils
something that has lasted from a living thing that died long ago
soil
the loose material in which plants can grow
clay
a soil made up of very small grains
loam
a rich soil with lots of humus
sand
soil made up of large grains
humus
a part of soil made up of decayed parts of once living things
erosion
the movement of weathered rock and soil
weathering
the way rocks are broken down into smaller pieces
mold
the shape of a plant or animal left in sediments when the rock formed
imprint
molds of leaves or other thin objects
cast
formed when mud or minerals fill the mold