7.4 Volcanic Landforms and Geothermal Activity

What is formed when there is not enough magma or pressure to create an explosive eruption?

• Lava dome

• Lava flow

• Magma chamber

• Volcanic ash

What is the characteristic of lava that leads to the formation of a lava dome?

• High temperature

• High viscosity

• Low density

• Low temperature

What happens if there is enough pressure and magma for an explosive eruption?

• A lava dome forms

• A volcanic eruption occurs

• A magma chamber forms

• A geyser erupts

What is the process called when lava flows over an area and solidifies?

• Erosion

• Sedimentation

• Lava flow

• Crystallization

What is the main component of igneous rock in lava plateaus?

• Quartz

• Basalt

• Limestone

• Shale

What is the significance of the Columbia Plateau in terms of size?

• It is the smallest plateau in the world

• It covers more than 161,000 square kilometers

• It is larger than the Sahara Desert

• It is the highest plateau in the world

How is new land created according to the text?

• By erosion of mountains

• By solidification of lava

• By deforestation

• By mining activities

What natural process can create whole islands over time?

• Earthquakes

• Tornadoes

• Volcanic eruptions

• Tsunamis

Over how many years have the Hawaiian Islands grown?

• 1 million years

• 3 million years

• 5 million years

• 10 million years

How do most hot springs compare in temperature to the maximum temperatures beneath the surface?

• Much cooler

• Much hotter

• The same

• Slightly warmer