The remains or traces of a plant or animal that has been preserved in earths crust.
What is a fossil?
100
-forms in nature
-is a solid
-has a definite chemical makeup
-has a crystal structure
What is the characteristics of a mineral?
100
A rock that has been melted.
What is molten rock?
100
A substance that a mineral has to make it fizz.
What is calcium carbonate?
100
Shows when and what happened using numbers.
What is a numeric timeline?
200
The remains or trace of an organism that lived for a short amount of time but lived all around the world.
What is an index fossil?
200
Igneous, metamorphic, and sedimentary
What is the three major types of rocks?
200
The process of moving wind or water that pick up bits of rock and moves it to one place to another.
What is erosion?
200
They make up 90% of the earths surface.
What is silicates?
200
Shows how different parts of earth history compared to the whole world?
What is a proportional timeline?
300
These first appeared about 550 million years ago in the Paleozoic era.
What is a trilobite?
300
A substance that holds sediments or grains of sand together.
What is a matrix?
300
A crack in the ground formed by a narrow piece of ice.
What is ice wedging?
300
It is formed by dead marine organisms.
What is calcite?
300
Appeared 550 mya in the Paleozoic era.
What are trilobites?
400
These can be found in rocks, near or in water, and in mountains.
What is a fossil?
400
Particles of rock that have been eroded.
What are sediments?
400
When rocks break apart to form something new.
What is weathering?
400
The most common group of rock forming minerals.
What is silicates?
400
Existed for about 4.5 billion years.
What is earth?
500
A fossil group of extinct marine arthropods that form the class trilobita.
What is a trilobite?
500
The is the process in which rocks can change from one another. This cycle has been going on since earth formed. It is still happening today and it will continue to happen as long as earth exists.