7G Science HW#16: Chapter 6.1 and 6.2

A weak spot in the crust where magma has come to the surface is called ______.

• Volcano

• Magma

• Lava

• Ring of fire

A major belt of volcanoes that rims the Pacific Ocean is called ______.

• Volcano

• Magma

• Lava

• Ring of fire

A string of islands formed by the volcanoes along a deep ocean trench is called _____.

• Island arc

• Hot spot

• Magma chamber

• Pipe

The pocket beneath the volcano where magma collects is called _____.

• Island arc

• Hot spot

• Magma chamber

• Pipe

The opening through which molten rock and gas leave a volcano is called ______.

• Magma chamber

• Pipe

• Vent

• Lava flow

A bowl-shaped area that forms around a volcano’s central opening is called _____.

• Lava flow

• Crater

• Silica

• Pahoehoe

A hot, fast-moving type of lava that hardens to form smooth, ropelike coils is called ____.

• Pahoehoe

• Aa

• Pyroclastic flow

• Active

A slow-moving type of lava that hardens to form rough chunks is called ____.

• Pahoehoe

• Aa

• Pyroclastic flow

• Active

The expulsion of ash, cinders, bombs, and gases during an explosive volcanic eruption is called ____.

• Pahoehoe

• Aa

• Pyroclastic flow

• Active

It is said of a volcano that does not show signs of erupting in the near future is called ____.

• Active

• Dormant

• Extinct