Plate Tectonics, Earthquakes, and Volcanoes
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26 terms
Terms | Definitions |
|---|---|
 Continental Drift | The earliest theory that states that the continents are moving apart into different locations on the earth. |
| Continental Drift | Alfred Wegener developed this theory. |
| Sea Floor spreading | is the process in which the ocean floor is extended (expands) when two plates move apart. |
| Plate Bounaries | Divergent, convergent, and transform are all examples of this. |
| Divergent Boundary | Plates that move in different direction and pull apart. |
| Convergent Boundary | Plates that crash and come together. |
| Transform Boundary | Plates that slip and slide past one another. |
| Plate Tectonics | This theory explains how landforms are made such as: islands, mountains, valleys, etc. |
| Earthquake | The trembling and/ or shaking of the ground. |
| Volcano | An opening or crack in the earth's surface through which lava flows. |
| Plate Tectonics | States that the earth is broken into plates which float over the asthenosphere. |
| Tremors | Small earthquakes. |
| Focus point | The point underground where the earthquake starts. |
| Epicenter | The point directly above the focus. This point is above the ground. |
| Seismograph | The instrument that measures the strength of the earthquake. |
| Richter scale | A scale used to measure the magnitude of an earthquake. |
| Lava | Magma that reaches the earth's surface. |
| Magma | Hot melted rock deep inside the earth. |
| Active volcanoes | Volcanoes that still erupt. |
| Dormant volcanoes | Volcanoes that are said to be asleep, but still have the possibility of erupting. |
| Extinct volcanoes | Volcanoes that will never erupt again. |
| Ring of fire | The circle of volcanoes the circle the pacific plate. |
| Composite Volcanoes | Volcanoes formed by alternating layers of lava and rock fragments. |
| Cinder cone Volcanoes | Volcanoes which have a bowl shped crates at the summit. |
| Shield Volcanoes | Volcanoes that have broad, sloping sides and are built from lava. |
| Lava dome Volcnaoes | Volacnoes built by slow eruptions and sometimes formed within a crater. |
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