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BMMS 6Science Ch 4
BMMS Science Ch 4 - Plate Tectonics
| Question | Answer |
|---|---|
| seismic waves | waves created by earthquakes that travel through the Earth |
| pressure | results from a force pressing on an area |
| crust | layer of rock that forms Earth's outer skin |
| mantle | layer of hot rock beneath the crust |
| lithosphere | the uppermost part of the mantle and the crust combine to form a ridgid layer |
| asthenosphere | soft part of the mantle |
| outer core | layer of molten metal that surrounds the inner core |
| inner core | a dense ball of solid metal |
| radiation | transfer of energy through space |
| conduction | heat transfer within a material or between materials that are touching |
| convection | heat transfer by the movement of currents within a liquid |
| density | a measure of how much mass there is in a volume of a substance |
| convection current | the flow that transfers heat within a liquid |
| continental drift | the idea that the continents slowly moved over Earth's surface |
| Pangaea | supercontinent formed by all the continents drifting together |
| fossil | any trace of an ancient organism that has been preserved in rock |
| mid-ocean ridge | undersea mountain chain that is part of a long system of mountains that winds beneath Earth's oceans |
| sonar | device that bounces sound waves off underwater objects and then records the echoes of these sound waves |
| sea-floor spreading | process that continually adds new material to the ocean floor |
| deep-ocean trenches | deep underwater canyons where the ocean floor bends downward and sinks back into the mantle |
| subduction | process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle |
| plates | separate sections of the lithosphere that are separated by cracks in the lithosphere |
| plate tectonics | theory that peices of Earth's lithosphere are in slow, constant motion, driven by convection currents in the mantle |
| faults | breaks in the Earth's crust where rocks have slipped past each other |
| spreading boundary | place where two plates move apart |
| rift valley | a deep valley that forms along a spreading boundary |
| colliding boundary | also called a convergent boundary - a place where two plates come together or collide |
| sliding boundary | a place where two plates slip past each other, moving in opposite directions |
Created by:
mrpowers
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