What Happens When Two Tectonic Plates Move Apart

What Happens When Two Tectonic Plates Move Apart?

A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries earthquakes are common and magma (molten rock) rises from the Earth’s mantle to the surface solidifying to create new oceanic crust. … When two plates come together it is known as a convergent boundary.

What happens when two tectonic plates separate?

The plates diverge and this causes the construction of new rock. It happens when two tectonic plates pull apart and rock from the mantle rises up through the opening to form new surface rock when it cools. It happens at the start of a new ocean and continues at the mid-ocean ridge while the ocean is opening.

What is it called when two tectonic plates move apart?

Most geologic activity stems from the interplay where the plates meet or divide. The movement of the plates creates three types of tectonic boundaries: convergent where plates move into one another divergent where plates move apart and transform where plates move sideways in relation to each other.

What will happen if two oceanic plates collide?

When two oceanic plates collide one oceanic plate is eventually subducted under the other. … As the subducting plate descends into the mantle where it is being gradually heated a benioff zone is formed. This benioff zone is a zone of shallow intermediate and deep focused earthquakes.

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What are the result of plate tectonics?

The movement of these tectonic plates is likely caused by convection currents in the molten rock in Earth’s mantle below the crust. Earthquakes and volcanoes are the short-term results of this tectonic movement. The long-term result of plate tectonics is the movement of entire continents over millions of years (Fig.

What is the meaning lithosphere?

The lithosphere is the solid outer part of the Earth. The lithosphere includes the brittle upper portion of the mantle and the crust the outermost layers of Earth’s structure. It is bounded by the atmosphere above and the asthenosphere (another part of the upper mantle) below.

What happens when two oceanic plates collide quizlet?

When two oceanic plates collide the denser plate is subducted and some material rises upward and forms an ISLAND. … Ocean floor is pushed away from a midocean ridge to form new sea floor.

What do we call the continuously moving part of the earth’s crust?

tectonic plates

The Earth’s crust and upper part of the mantle are broken into large pieces called tectonic plates. These are constantly moving at a few centimetres each year. Although this doesn’t sound like very much over millions of years the movement allows whole continents to shift thousands of kilometres apart.

What is Earth’s crust that is thinner but denser?

Oceanic crust is generally composed of dark-colored rocks called basalt and gabbro. It is thinner and denser than continental crust which is made of light-colored rocks called andesite and granite.

What is the scientific definition of asthenosphere?

asthenosphere zone of Earth’s mantle lying beneath the lithosphere and believed to be much hotter and more fluid than the lithosphere. The asthenosphere extends from about 100 km (60 miles) to about 700 km (450 miles) below Earth’s surface.

What happens when two continental plates smash into one another quizlet?

What happens at convergent boundaries where two continental plates collide? a collision between two continental plates crunches and folds the rock at the boundary lifting it up and leading to the formation of mountains and mountain ranges.

What is happening when two plates are smashing into one another quizlet?

Convergent Plate Boundary. Place where two plates smash into each other. Oceanic-Oceanic Convergence. Occurs when two oceanic plates converge one is usually subducted under the other and in the process a deep. oceanic trench is formed.

What happens to tectonic plates at a convergent boundary?

Convergent boundaries: where two plates are colliding.

The denser plate is subducted underneath the less dense plate. The plate being forced under is eventually melted and destroyed. Island arcs and oceanic trenches occur when both of the plates are made of oceanic crust.

Are Continents still moving?

Today we know that the continents rest on massive slabs of rock called tectonic plates. The plates are always moving and interacting in a process called plate tectonics. The continents are still moving today. … The two continents are moving away from each other at the rate of about 2.5 centimeters (1 inch) per year.

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How do plate tectonics cause earthquakes?

Earthquakes occur along fault lines cracks in Earth’s crust where tectonic plates meet. They occur where plates are subducting spreading slipping or colliding. As the plates grind together they get stuck and pressure builds up. Finally the pressure between the plates is so great that they break loose.

Why are plates moving?

Tectonic shift is the movement of the plates that make up Earth’s crust. … 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.

Is the core of the Earth?

Earth’s core is the very hot very dense center of our planet. The ball-shaped core lies beneath the cool brittle crust and the mostly-solid mantle. The core is found about 2 900 kilometers (1 802 miles) below Earth’s surface and has a radius of about 3 485 kilometers (2 165 miles).

What is the lithosphere made of?

The term Lithosphere is Greek for “rock layer.” Comprised of the crust and uppermost part of the mantle the lithosphere consists of cool rigid and brittle materials. Most earthquakes originate in the lithosphere.

What type of rock makes up the continents?

granitic rocks

Continental crust is composed largely of granitic rocks that are of low-density.

Why is Earth’s interior hot?

There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted which has not yet been lost (2) frictional heating caused by denser core material sinking to the center of the planet and (3) heat from the decay of radioactive elements.

What does the core of the earth also known as?

The inner most layer of the earth is called the “Core or Barysphere”. It is otherwise known as NIFE because of the presence of Nickel and Ferrous (iron).

What is the meaning of Moho?

Definition of Moho

: the boundary layer between the earth’s crust and mantle whose depth varies from about 3 miles (5 kilometers) beneath the ocean floor to about 25 miles (40 kilometers) beneath the continents.

What happens geologically when a continental plate collides with another continental plate?

Plates Collide When two plates carrying continents collide the continental crust buckles and rocks pile up creating towering mountain ranges. … Plates Slide Past One Another Plates grinding past each other in opposite directions create faults called transform faults.

When two continental plates come together at a convergent boundary the result is?


When two continental plates converge they smash together and create mountains. The amazing Himalaya Mountains are the result of this type of convergent plate boundary. The Appalachian Mountains resulted from ancient convergence when Pangaea came together.

When two plates move together lithosphere is quizlet?

Convergent Boundaries: occurs where two plates move together oceanic lithosphere plunging beneath an overriding plate.

What is the strongest evidence that indicates that part of Earth’s interior is liquid?

The existence of Earth’s magnetic field itself is evidence that the outer core is liquid. The outer core is believed to contain a system of convection currents that create a dynamo effect and generates this field.

How do we know earth has a liquid core?

Scientists figured out that the outer core must be liquid because S waves do not pass through it but P waves do. … Thus by observing many seismic waves from many earthquakes all over the world scientists have been able to work out the density of different parts of the Earth (i.e. the core mantle and crust).

Which part of the Earth has the greatest density?

inner core
The inner core of the Earth has the highest density and temperature.

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What will the world look like in 200 million years?

Pangea broke apart about 200 million years ago its pieces drifting away on the tectonic plates — but not permanently. The continents will reunite again in the deep future. … The planet could end up being 3 degrees Celsius warmer if the continents all converge around the equator in the Aurica scenario.

Can Pangea happen again?

The answer is yes. Pangaea wasn’t the first supercontinent to form during Earth’s 4.5-billion-year geologic history and it won’t be the last. … So there’s no reason to think that another supercontinent won’t form in the future Mitchell said.

Will Australia and Asia collide?

Australia is also likely to merge with the Eurasian continent. “Australia is moving north and is already colliding with the southern islands of Southeast Asia ” he continued. … Still over millions of years that minute movement will drive the continents apart.

How plate tectonic motion affects the planet?

Even though plates move very slowly their motion called plate tectonics has a huge impact on our planet. Plate tectonics form the oceans continents and mountains. It also helps us understand why and where events like earthquakes occur and volcanoes erupt.

How do tectonic plates move?

Plate tectonics move because they are carried along by convection currents in the upper mantle of the planet (the mantle is a slowly flowing layer of rock just below Earth’s crust). Hot rock just below the surface rises and when it cools and gets heavy it sinks again.

How do tectonic plates affect volcanoes?

On land volcanoes form when one tectonic plate moves under another. Usually a thin heavy oceanic plate subducts or moves under a thicker continental plate. … When enough magma builds up in the magma chamber it forces its way up to the surface and erupts often causing volcanic eruptions.


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