What method determines the absolute age of a rock?
Radiometric dating
100
The breaking apart of Pangea into separate continents is evidence of this theory.
Continental drift.
200
Gravity is a cause of this process that moves rocks.
Erosion.
200
Which method is used to determine whether a rock is older or younger than another rock?
Relative dating, law of superposition.
200
What is the cause for the continents shifting apart?
Plate tectonics.
300
This substance reacts with rocks to cause chemical weathering.
Acid.
300
How old is the earth?
4.6 billion years old. LIFE ON EARTH DID NOT START UNTIL 3.6 billion years ago and it started as one-celled organisms.
300
Fossils of a reptile from 200 million years ago have been found in South America and Africa. What can you infer from this information.
The continents were once connected.
400
Repeated melting and freezing of water in rocks is an example of one of the 2 kinds of weathering. Which is it?
Mechanical weathering.
400
If an intrusion cuts through a layer, is it older or younger than that layer?
Younger, because it is cutting through the layer so that layer had to be there first.
400
What causes the plates on the lithosphere to move?
Movement of magma in earth's mantle.
500
In what two ways do plants help prevent erosion?
Roots hold soil in place.
Block the wind from moving sediments.
500
An unusual type of fossil clam is found in rock layers high in the Swiss Alps. The same type of fossil clam is also found in the Rocky Mountains of North America. What can scientists conclude from this?
The layers of rocks in which the fossils were found are from the same geologic age.
500
What is the relationship between plate tectonics, and volcanoes and earthquakes?
Earthquakes and volcanoes occur on plate boundaries where plates meet and run into each other.