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What is continental in plate tectonics?

What is continental in plate tectonics?

Tectonic plates not only move land masses (continental crust), but also oceans (ocean crust). Since the plates are floating on liquid rock, they are constantly moving and bumping against each other. Seafloor spreading occurs on the seafloor where oceanic plates are moving away from each other (diverging).

What are the places where tectonic plates meet called?

Most volcanoes, mountains, and earthquakes occur where plates meet. Places where plates meet are called plate boundaries. There are seven major plates along with countless minor plates. You can see that a plate can be made of both oceanic crust and continental crust.

What is a continental tectonic plate mostly covered by?

The plates are around 100 km (62 mi) thick and consist of two principal types of material: oceanic crust (also called sima from silicon and magnesium) and continental crust (sial from silicon and aluminium).

What are the margins of a tectonic plate called?

Continental coastlines that occur within the interior of a tectonic plate are called ________ margins. Nice work! You just studied 30 terms! Now up your study game with Learn mode. Pillow basalts attain their distinctive blob-like shapes because their parent lavas do not travel far prior to solidification. This is because the parent lavas ________.

Which is type of plate is older continental or oceanic?

Exposed continental shields (or cratons) of mainly Precambrian (older than 570 million years) crystalline igneous and high-grade (formed at high temperatures and pressures) metamorphic rocks. Continental platforms mainly of gently folded younger low-grade (formed at low temperatures) metamorphic rocks overlying Precambrian basement rocks.

Where does most of plate tectonics take place?

The lithosphere consists of rigid plates on a non-rigid subsurface (from approximately 70 km – 700 km in depth). Tectonic processes mostly take place at the plate edges. A plate moves as a single entity along the surface of the Earth over a plastic mantle. There are two types of plate: Oceanic plates form at the mid-ocean ridges.

Summed over the entire surface of Earth, the rate of spreading at divergent boundaries is ________ lithospheric consumption at subduction zones. At transform plate boundaries, ________. The volcanoes of the Cascades Mountains in the northwest United States are related to melting of rock associated with a ________ boundary.