by : Clay Brillhart

a mountain formed from rock layers being squeezed together

a mountain made by huge tilted blocks of rocks separated from other rocks by faults

the breaking down of other rocks into smaller pieces by natural process 

the picking up and removal of rock particles

a mixture of weathered rock, decayed plant and animals, living things, air, and water

material in soil formed by the breakdown of plant and animal matter

any of the layers of soil from the surface to the bedrock 

water that soaks into soil and rock by collecting in spaces between rock particles

the downhill movement of Earth material caused by gravity

the dropping of of sediment

a huge sheet of ice and snow that moves slowly over land

a jumble of many sizes of sediment deposited by a glacier

a deposit of many sizes of sediment in front of or along the sides of a glacier

a naturally occurring solid in Earth's crust with a definite structure

a rock that forms when when hot, liquid lava cools and hardens into a solid

a rock that forms from pieces of other rocks that are squeezed or cemented together

rocks continually changing from one kind into another in a never ending process

a rock that forms from another kind of rock that is changed by heat, pressure, or a chemical reaction

the thought that in a series of rock layers the rock on the bottom is the oldest and the rock on the top is the youngest

the thought that in a series of rock layers on the bottom is the oldest and the rock on the top is the youngest

a listing of of Earth's rock layers in order from oldest to youngest

any trace, imprint, or remains of a living thing preserved in Earth's crust

the remains of a living thing that lived for a short part of Earth's history

the time it takes for  the radioactive element in a rock to break apart into other elements

the age of rock in years, determined by measuring the decay rate of it's radioactive elements

one of the four long stretches of time in Earth's history