Magma is molten rock found beneath the Earth's surface. When magma erupts onto the surface, it's called lava. Volcanic structures are the landforms created by these eruptions, such as shield volcanoes, composite volcanoes, and cinder cones. Understanding these concepts helps us understand how our planet changes over time and the forces that shape it.
Match the term with its correct definition:
| Term | Definition |
|---|---|
| 1. Magma | A. A volcano formed from alternating layers of ash and lava. |
| 2. Lava | B. A steep-sided volcano formed from ejected lava fragments. |
| 3. Composite Volcano | C. Molten rock that has reached the Earth's surface. |
| 4. Shield Volcano | D. Molten rock beneath the Earth's surface. |
| 5. Cinder Cone | E. A broad, gently sloping volcano built from fluid lava flows. |
Complete the following sentences using the words provided (eruption, viscosity, silica, volcanoes, plate tectonics).
The movement of __________ can cause __________ to form. The __________ of magma is influenced by its __________ content. A violent volcanic __________ can release ash and gas into the atmosphere.
Explain how the composition of magma affects the type of volcanic eruption that occurs. Provide specific examples to support your answer.
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