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Science Topic 4
Science Topic 4 Plate Motions
| Question | Answer |
|---|---|
| What kind of fault does tension produce? | Normal Fault |
| What is an ocean trench? | undersea valleys |
| Fault | A break in the Earth's crust or mantle |
| An extinct volcano is | volcano that poses very little threat of eruption |
| When a volcano collapses on it itself it forms a | caldera |
| The molten mixture of rock-forming substances, gases, and water from the mantle is | Magma |
| Where does subduction occur | Ocean trenches |
| Which boundary forms when plates come together | Convergent |
| Quiet eruptions produce? | Magma low in silica and thin, runny lava |
| What is another name for a stratovolcano? | Composite |
| Tension | stress that pulls on Earth's crust stretching it to make it thinner |
| What is a seismograph? | An instrument used to record the seismic waves produced by an earthquake |
| Ash, cinders, and bombs produce what kind of eruptions | Explosive |
| What type of fault has compression | Reverse fault |
| Sea-floor spreading occurs at what type of boundary? | Divergent |
| Names of the two types of folds? | Anticlines and Synclines |
| Convergent, Divergent, and Transform are what? | Names of boundaries |
| The place where magma collects before it erupts is the | Magma chamber |
| A volcano that may erupt again at some point in the distant future is | Dormant |
| The type of crust that is dense and found at the bottom of the ocean floor | oceanic crust |
| How do plate interact at their boundaries? | the type pf boundary and how they are moving |
| What kind of lava and eruption will occur in a volcano with high silica magma | Sticky lava with an explosive eruption |
| When magma reaches the surface before cooling what does it produce | Volcano at a convergent boundary |
| A flat hardened lava build up that flows out of the Earth's crust over periods of a long time are | lava plateau |
| Compression is | pressure that squeezes rocks until it bends or breaks |
| What type of crust is thicker and less dense than oceanic crust | continental crust |
| Rock that is pushed in two opposite directions when it bends or breaks produces | shearing |
| The region around the Pacific Ocean prone to volcanic activity and earthquakes is known as the | Ring of Fire |
| A zipper like chain of undersea mountains is | Mid-ocean ridge |
| What is subduction | The sinking movement of ocean floor back into the mantle |
| How do convection currents help drive plate motions | The hot melted rock rises and the cooler rock sinks back into mantle |
| Molten rock that flows up through the crack in the Earth's crust that hardens into sold strips of new rock on both sides of the crack is what process | sea-floor spreading |
| What type of volcano alternates between lava and ash, cinders, and bombs | Cinder cone |
| A volcano that is erupting or has shown signs that it may erupt in the future is called | Active volcano |
| Strike-slip fault can produce what kind of stress? | Shearing |
| Magnitude | The number geologists use to assign to an earthquake based on their size |
Created by:
Sfrederickson101622
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