Seashells and other dead marine organisms get piled up over time and get cemented together
How is limestone formed?
100
A rock formed when molten rock cools and hardens.
What is an igneous rock
100
This type of rock is the most likely to contain fossils.
Are sedimentary rock the most likely to contain fossils?
100
Formed 4.5 billion years ago
When was Earth formed?
100
They are formed in nature, have a definite chemical make up, are solid, and have a crystal structure.
What are the four characteristics of a mineral?
200
This rock is formed when slate changes due to heat and pressure.
How is schist formed?
200
Cements the particles that make up a sedimentary rock.
What is matrix?
200
This person discovered fossils in Antarctica?
Who is Wegener?
200
They appeared 200,000 years ago
When did humans first appear?
200
This refers to the rock that has melted.
What is molten rock?
300
This rock forms when slate, a metamorphic rock changes due to heat.
How is schist form?
300
This is one of Earth's destructive processes?
What is erosion,weathering and,ice wedging?
300
This provides scientists evidence about Earth's prehistoric enviroment.
Why are fossils important to geologists?
300
A timescale that shows mow many years ago different events happened.
What is a numeric timeline?
300
This makes up %90 of Earths crust
What percent of Earths crust does silicates make?
400
This rock is formed when sandstone, a sedimentary rock changes due to heat and pressure.
How is quartzite formed?
400
The settling of eroded material
What is deposition?
400
This organism lived only for a short period of time, but can be found many places around the world.
What is an index fossil?
400
This terrible event happened 251 million years ago.
When did the Great Extinction occur?
400
The tendency of a mineral to break into irregular pieces.
What is fracture?
500
This rock forms when limestone is exposed to extreme heat and pressure and the calcite cristalizce?
How is marble formed?
500
This rock is magma that cooled down and makes up a lot of the ocean floor
What is basalt?
500
This fossils are important to geologists because when they are found in a rock layer geologists know the rock layers are the same age as other rock layers that contain the same fossils.
Why are index fossils important to geologists?
500
This creatures appeared during the early cambrian period and became extinct late paleozoic.
When did trilobites first appear and when did the become extinct?
500
This is a way in which the light reflects from the minerals surface.