Geologic Time
Any trace, imprint, or remains of a living thing preserved in Earth's crust.
What is a fossil?
These are the 5 things soil is made of.
What are rocks, humus, air, water, and living things?
Frost action abrasion in moving water are examples of this type of weathering.
What is mechanical weathering?
This type of rock forms from pieces of other rocks that are squeezed or cemented together.
What are sedimentary rocks?
The age of rock in actual years.
What is actual age?
This is what an old river looks like.
It has many curves, twists, and turns.
The process of breaking down rocks into smaller pieces by natural processes.
What is weathering?
This type of rock forms when hot, molten rock cools and hardens into a solid.
What is igneous rock?
The age of a rock compared to the age of another rock. This is not a specific age.
What is relative age?
The dropping off of sediment.
What is deposition?
Rocks that start out as another type of rock and change into this type of rock when great heat, pressure, and chemical changes occur.
What are metamorphic rocks?
The remains of living things that were widespread at one point in time, but only lived for a short part of Earth's history.
What is an index fossil?
The picking up and moving of rock particles.
What is erosion?
The idea that rock layers form in a series with the bottom layer being the oldest and the top layer being the youngest.
What is superposition?
The era in which there was an "explosion" of life, including the first forests.
What is the Paleozic Era?
Material in soil formed by the breakdown of plant and animal material. (dead and decaying animals and plants)
What is humus?
A deposit of many sizes of sediment in front of or along the sides of a glacier
What is a moraine?
The idea that sedimentary rocks form in horizontal layers.
What is original horizontality?