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

17 terms by apcoker 

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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

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