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22 terms

TA Rocks, Minerals, and Soil

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clay
type of soil that turns very hard when dry
composting
process for making decomposing plant matter necessary for soil
fossil
the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
horizons
Layers of soil
humus
decaying plant and animal matter
inexhaustible resources
resouces that humans and use and never use up
crystals
atoms arranged in repeating patterns
luster
the way a mineral reflects light
minerals
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
silt
slippery soil that can hold water
soil
a mixture of rock, plant material , animal matter, water, and air
soil conservation
preserving soil by using it wisely
streak
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
gas
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