Science Chapter 8

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created 7 years ago by asaunier
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1

Vent

Opening where magma is forced up and flows out onto Earth's surface as lava forming a volcano.

2

Crater

Steep walled depression around a volcano's vent

3

Hot Spot

Result of an unusually hot area at the boundary between Earth's mantel and core that forms volcanos when melted rock is forced upward and breaks through the crust

4

Volcano

An opening in Earth that erupts gases, ash, and lava

5

Shield Volcano

Broad, gently slopping volcano formed by quiet eruptions of basaltic lava

6

Tephra

Bits of rock or solidified lava dropped from the air during an explosive volcanic eruption

7

Cinder Cone Volcano

Steep-sided, loosely packed volcano formed when tephra falls to the ground

8

Composite Volcano

Volcano built by altering explosive and quiet eruptions that produce layers of tephra and lava

9

batholith

largest intrusive igneous rock body that forms when magma being forced upward towards Earth's crust cools slowly and solidifies underground

10

Volcanic Neck

Solid igneous core of a volcano left behind after the softer cone has been eroded.

11

Dike

Igneous rock feature formed when magma is squeezed into a vertical crack that cuts across rock layers and hardens underground

12

Caldera

Large circular-shaped opening formed when the top of a volcano collapses

13

Sill

Igneous rock feature formed when magma is squeezed into a horizontal crack between layers of rock and hardens underground