Alexis Wilson 

A mountain made up of mostly rock layers

A mountain made by huge tilted blocks of rocks separated from surrounding rocks by faults 

The breaking down of rocks into smaller pieces by natural processes 

The picking up and removal of rock particles 

A mixture of weathered rock, decayed plant and animal matter 

Material in soil formed by the breakdown of plant and animal meterial

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 off 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 or along the side of a glacier. 

A naturally occurring solid in Earth's crust with a definite structure and composition.

A rock that forms when hot, liquid lava cools and hardens 

A rock that forms from pieces of other rocks that are squeezed together

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

Rock continually changing from one kind into another

The idea that in a series of rock layers, the bottom layer is the youngest

The age of a rock as compared with another rock

A listing 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 was widespread but lived for only a short part of Earth's history 

The time it takes for half the mass of a radioactive element in a rock to break apart, or decay

The age of a rock in years

One of four long stretches of time in Earth's history