_______________ can be very difficult to cross even with roads and bridges.
Mountains
100
_______________ are sudden changes in the Earth. They happen very quickly and cannot be predicted.
Earthquakes
100
What is a fold mountain?
A fold mountain forms where continental plates collide, causing the Earth's crust to crumple and fold.
100
________________ helps scientists analyze date to find the epicenter of the earthquake.
Seismographs
100
Lava can be hotter than_______________.
A. 5,000°F
B. 1,000°F
C. 1,100°F
D. 2,000°F
D. 2,000°F
200
California is on what plate?
California is on the North American Plate.
200
Where do normal faults occur?
They occur near or at divergent boundaries.
200
What are volcanoes?
They are mountains formed by magma. The magma escaped, then cooled, forming a volcano.
200
What are some effects of major earthquakes?
Some cause landslides, destroy plants or animals and their habitats. Earthquakes also destroy buildings and start fires. Other possible answers are gas and water mains, trees, and power lines.
200
As magma rises in the volcano, pressure ____________ and gases can _____________.
Decreases and escape.
300
Where does volcanic activity usually happen?
Volcanic activity usually happens at convergent boundries.
300
What kind of waves travel through Earth's interior?
Body waves
300
An _______________ are formed by volcanoes that form a string of islands.
Island Arc
300
Some earthquakes are in the ocean. These sometimes cause________________.
Tsunamis
300
What are some effects of volcanoes? What do they do to earth's surface?
Volcanoes can destroy cities, kill wildlife and destroy their homes, and set fire to forests. Another possible answer is they expel hot and poisonous gases.
400
When does folding occur?
It occurs when continental tectonic plates collide. They create some of the worlds tallest mountain ranges.
400
Where do reverse faults occur?
Reverse faults occur at convergent plate boundaries.
400
Cinder cone volcanoes are the _______________ volcanoes. They are volcanoes with slopes made mostly out of ______ and________.
Smallest, rock, ash.
400
What is the Richter scale based on?
The Richter scale is based on the seismograph recordings.
400
What is one example of an island arc?
The Aleutain Islands of Alaska.
500
What is an example of erosion mountain?
The Catskills in the New York State are one example. Another example would be Mount Minsi in Pennsylvania.