Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
gChapter 6 Science
This vexes me.
| Question | Answer |
|---|---|
| Earthquake | The rapid movement of the ground due to the movement of tectonic plates |
| Volcano | A place formed where there is a gap in the Earth's crust, allowing lava, ash and gases to escape from below the surface, often forced out by extreme pressures |
| Why do earthquakes occur at plate boundaries? | Tectonic plates interact with each other in many ways, including sliding past each other, colliding or moving apart, which can cause earthquakes in that area |
| Seismic data | Data about movements of the ground that scientists use to study and monitor earthquakes |
| Theory of plate tectonics | Scientific theory describing the existence and motion of tectonic plates |
| Tectonic plate | A section of the lithosphere that moves about on the Earth's surface |
| Hot spot volcanoes | Formed when a tectonic plate moves over a hot spot area, which is where super-hot material rises from inside the Earth. As the plate continues to move, a chain of island volcanoes is created. Volcanoes become extinct as they move away from the hot spot. |
| Intraplate earthquake | An earthquake that occurs away from a plate boundary. It happens when stress build up in the Earth's crust. |
| Seismic waves | Wavelike motion from when energy is transferred from the interaction between the plate boundaries during an earthquake |
| Focus | Where the earthquake occurred underground |
| Epicentre | Point on the surface of the Earth straight above the focus |
| Primary waves | Travel the fastest and can travel through solids, liquids and gases, least damaging wave |
| Secondary waves | Slower than P-waves and can only travel through solids |
| Surface waves | Can only travel along the Earth's surface and causes the most damage, slowest wave |
| Seismograph | When a seismometer is connected to a recording device. It works by having a heavy weight resisting the motion of the earthquake while the rest of the instrument is caused to shake. The motion of the weight is the seismogram. |
| Magnitude | Describes the amount of energy transferred by seismic waves on a scale of 1-10 |
| Intensity of an Earthquake | Measured by its effects on the landscape by the Mercalli intensity scale, which uses observations by people |
| Biological evidence for the theory of plate tectonics | Matching plant and animal fossils on widely separated continents |
| Geographic evidence for the theory of plate tectonics used by Alfred Wegener | Matching coastline shapes and identical rock formations on widely separated continents |
| Where is new crust made? | Mid-ocean ridges-a mountain system on the floor of the ocean, made from divergent boundaries |
| Ridge push | The force that pushes tectonic plates at divergent boundaries as new crust spreads out from mid-ocean ridges |
| Slab pull | The process of older, colder plates sinking into the aesthenosphere below due to gravity. This is believed to be the main driving force for the motion of tectonic plates. |
| As crust is destroyed as it sinks into the mantle, | New crust is created at the ridges |
| Rift valley | A valley created by a geological rift or split, often at a divergent plate boundary |
| Subduction | When one plate sinks below another plate during a collision at convergent plate boundaries. Can cause continental plate to deform, forming volcanoes. |
| How mountains form | As convergent plate boundaries interact, they push up material from the Earth's crust and form mountains |
| Geographic evidence for the theory of plate tectonics | Mountains, hot spot volcanoes, seafloor spreading, magnetic striping, dating rocks |
| Convergent boundary | A boundary at which plates are being pushed together. Can produce taller mountain ranges. Also where subduction occurs which depends on the densities of the plates. |
| Divergent boundary | A boundary where plates move apart. Can produce mid-ocean ridges from ridge pushes. |
| Transform boundary | A boundary where plates slide against each other, sometimes creating fault lines. Can cause earthquakes as pressure created by movement is released. |
| Trench | A deep depression in the ocean floor. Usually occurs when an oceanic plate subducts another oceanic or continental plate. |
Created by:
thesomething
Popular Science sets