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LMS Ch 13.1 DR
Volcanoes and Plate Tectonics Directed Reading
Question | Answer |
---|---|
The cause of many volcanic eruptions is the movement of?? | Earth’s tectonic plates. |
The movement of tectonic plates is driven by Earth’s?? | Internal heat. |
Scientists can learn more about volcanic eruptions by studying?? | Temperatures within Earth. |
Combined temperature and pressure in the lower part of Earth’s mantle keeps rocks?? | Below their melting point. |
Despite high temperature, most of the mantle remains solid because of the?? | Large amount of pressure from the surrounding rock. |
Sometimes Earth’s solid mantle and crust melt to form?? | Magma. |
Which of the following is NOT a way magma can form?? | Addition of fluids, such as water, increase the melting point of some minerals in the rock. |
Magma rises upward through the crust because?? | The magma is less dense than surrounding rock. |
As hot bodies of magma rise toward the surface and melt surrounding rock?? | They become larger. |
Lava flows from an opening in Earth’s surface called a?? | Vent. |
Volcanoes erupt on Earth’s surface?? | Mostly near tectonic plate boundaries. |
A major zone of active volcanoes encircling the Pacific Ocean is called?? | The Pacific Ring of Fire. |
The Pacific Ring of Fire is also one of Earth’s major?? | Earthquake Zones. |
Many volcanoes are located along?? | Subduction Zones. |
One tectonic plate moves under another along a(n)?? | Subduction Zone. |
When a plate of oceanic lithosphere meets one that consists of continental lithosphere, the oceanic lithosphere?? | Moves beneath the continental lithosphere. |
On the ocean floor, along the edge of the continent where the plate is subducted?? | A deep trench forms. |
When magma rises through the lithosphere to Earth’s surface?? | Volcanic mountains form along the tectonic plate. |
When two plates with oceanic lithosphere at their boundaries collide?? | One plate subducts, forming a trench. |
If two plates with oceanic lithosphere collide?? | Magma forms as fluids are introduced into the mantle. |
When oceanic lithosphere subducts beneath oceanic lithosphere, magma rises to the surface to form an?? | Island arc. |
An example of the early stages of an island arc are the?? | Aleutian Islands. |
As island arcs become larger, they join to form one landmass, such as the islands that make up the?? | Islands of Japan. |
Volcanism?? | Any activity that includes the movement of magma toward or onto Earth’s surface. |
Lava?? | Magma that flows onto Earth’s surface. (Only that one.) |
Volcano?? | A vent or fissure in Earth’s surface through which magma and gases are expelled. |