Volcanoes

What is a weak spot in the crust where molten material, or magma, comes to the surface?

When ​ (a)   reaches the surface, it is called ​ (b)   .

• magma
• lava

What is the one major volcanic belt that is formed by the many volcanoes that rim the Pacific Ocean?

• Ring of Fire

• Great Rift Valley

• Mount Etna

• Volcano

Most volcanoes form along ​ (a)   (pull apart) plate boundaries such as mid-ocean ridges and along ​ (b)   (push together) plate boundaries where subduction takes place.

• diverging
• converging

What is formed near the boundary of the Eurasian and African plates?

• Ring of Fire

• Great Rift Valley

• Mount Etna

• Volcano

Long, underwater mountain ranges that sometimes have a rift valley down their center are called ​ (a)  

• mid-ocean ridges
• rift valley's

There are several large volcanoes along the ___________ in East Africa.

• Ring of Fire

• Great Rift Valley

• Mount Etna

• Volcano

What happens along the rift valley in the ocean floor?

• A) Lava pours out of cracks

• B) Water flows in

• C) Earthquakes occur

• D) Mountains erode

The resulting volcanoes create a string of islands called an ______.

• island arc

• deep ocean trench

• tectonic plates

• volcanoes

The curve of an island arc echoes the curve of its ___________.

• island arc

• deep ocean trench

• tectonic plates

• volcanoes