The three types of plate boundaries are
divergent, convergent, and transform
. They are described in the following three concepts. Most geological activity takes place at plate boundaries.
What are the 4 types of plate tectonics?
-
Divergent: extensional; the plates move apart. Spreading ridges, basin-range.
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Convergent: compressional; plates move toward each other. Includes: Subduction zones and mountain building.
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Transform: shearing; plates slide past each other. Strike-slip motion.
What are the 4 major sources of evidence for the theory of plate tectonics?
There is variety of evidence that supports the claims that plate tectonics accounts for
(1) the distribution of fossils on different continents
, (2) the occurrence of earthquakes, and (3) continental and ocean floor features including mountains, volcanoes, faults, and trenches.
What are the 3 theories of plate tectonics?
The three types of plate boundaries are
divergent, convergent, and transform
. They are described in the following three concepts. Most geological activity takes place at plate boundaries.
What are the theories of plate tectonics?
The theory of plate tectonics states that
the Earth’s solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere
, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.
What are the 2 theories behind why tectonic plates move?
Why do plates move? One explanation for plate movements is
slab pull
. Plates are extremely heavy so gravity acts upon them, pulling them apart. Alternatively, as shown in the diagram, convection currents under the Earth’s crust transfer heat, which rises through the surface and cools back down in a circular motion.
What are the two main types of tectonic plates?
The two types of tectonic plates are
continental and oceanic tectonic plates
.
What are the types of plates?
There are major, minor and micro tectonic plates. There are seven major plates:
African, Antarctic, Eurasian, Indo-Australian, North American, Pacific and South American
. The Hawaiian Islands were created by the Pacific Plate, which is the world’s largest plate at 39,768,522 square miles.
What are the 2 tectonic plates called?
There are two main types of tectonic plates:
oceanic and continental
.
What are the 5 evidences of continental drift theory?
They based their idea of continental drift on several lines of evidence:
fit of the continents, paleoclimate indicators, truncated geologic features, and fossils
.
Why do tectonic plates move?
The heat from radioactive processes within the planet’s interior causes the plates
to move, sometimes toward and sometimes away from each other. This movement is called plate motion, or tectonic shift.
How fast do tectonic plates move?
They can move at
rates of up to four inches (10 centimeters) per year
, but most move much slower than that. Different parts of a plate move at different speeds. The plates move in different directions, colliding, moving away from, and sliding past one another. Most plates are made of both oceanic and continental crust.
What are the 3 causes of plate movement?
Mantle dynamics, gravity, and Earth’s rotation taken
altogether causes the plate movements. However, convectional currents are the general thought for the motion.
What are the two types of crust?
Earth’s crust is divided into two types:
oceanic crust and continental crust
. The transition zone between these two types of crust is sometimes called the Conrad discontinuity. Silicates (mostly compounds made of silicon and oxygen) are the most abundant rocks and minerals in both oceanic and continental crust.
Is Pangea a theory?
Pangea’s existence was first proposed in 1912 by German meteorologist Alfred Wegener as a part of his
theory of continental drift
. Its name is derived from the Greek pangaia, meaning “all the Earth.”
What are the 7 major plate boundaries?
These divisions are inevitably somewhat arbitrary, but by convention we recognise seven main or “primary” tectonic plates: these are
the African Plate: Antarctic Plate, Eurasian Plate, Indo-Australian Plate, North American Plate, Pacific Plate, and South American Plate
.
