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type of soil that turns very hard when dry


process for making decomposing plant matter necessary for soil


the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock


Layers of soil


decaying plant and animal matter

inexhaustible resources

resouces that humans and use and never use up


atoms arranged in repeating patterns


the way a mineral reflects light


natural nonliving solids made of one or more elements

relative dating

figuring out the order in which events occurred

rock cycle

the process of rocks forming , wearing down, and them forming again


slippery soil that can hold water


a mixture of rock, plant material , animal matter, water, and air

soil conservation

preserving soil by using it wisely


the true color of a mineral

water retention

how well soil holds water

3 types of rocks

igneous, metamorphic, sedimentary

sedimentary rocks are formed by

loose material pressing together and forming over time

oxygen is a


soil is important to animal life because

it supports plant life which is essential in the food chain

soil can be lost to erosion by

animals that eat all of the plants

topsoil can be preserved by

planting trees and other plants

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