Where are deep ocean trenches formed?

Ocean trenches form on tectonic plate boundaries where the dense plate subducts below the less dense plate due to plate movement. These destructive plate boundaries result in a steep V-shaped valley or trench on the ocean floor. Ocean trenches occur in all the world’s ocean basins.

What causes deep trenches quizlet?

Ocean trenches are deep sections of the ocean where an oceanic plate is usually sinking below a continental plate. They are formed in the subduction zone as the denser oceanic plate is subjected under the continental plate.

What happened at the deep sea trenches?

Deep ocean trenches are formed during a process known as subduction. In subduction, one tectonic plate (a large portion of the Earth’s crust) slides under another. The subduction zones where ocean trenches form become long, deep valleys – very deep valleys!

Which ocean has no trench?

Pacific Ocean
Along passive plate margins there is no subduction zone (or trench) and the oceanic and continental crusts simply abut one another; there are thus no trenches or troughs along passive margins. [1] The Mariana Trench in the Pacific Ocean is the deepest place in the world ocean at -11,034 m water depth.

What causes the motion of tectonic plates?

The plates can be thought of like pieces of a cracked shell that rest on the hot, molten rock of Earth’s mantle and fit snugly against one another. The heat from radioactive processes within the planet’s interior causes the plates to move, sometimes toward and sometimes away from each other.

What are trenches geography?

A long narrow and steep-sided depression on the ocean floor is called a trench. They are deepest parts of the ocean floor and usually 5500 metres deep. The trenches are formed due to tectonic forces—either by down faulting or by done folding. They generally run parallel to the bordering folded mountains.

What process creates deep sea trenches?

Ocean trenches are a result of tectonic activity, which describes the movement of the Earth’s lithosphere. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.

What is the primary reason for the elevated position of the oceanic ridge system?

The primary reason for the elevated position of the ridge system is that newly created oceanic lithosphere is hot and therefore less dense than cooler rocks of the deep-ocean basin.

How was Marianas trench formed?

The Mariana Trench was formed through a process called subduction. Earth’s crust is made up of comparably thin plates that “float” on the molten rock of the planet’s mantle. This movement creates a trench where the descending oceanic plate drags down the edge of the overriding plate.

How does Philippine trench formed?

The trench formed from a collision between the Palawan and Zamboanga plates. This caused a change in geological processes going from a convergent zone to a subduction zone. The subduction zone is located west to east of the Philippine Islands. It hit the trench with a hypocenter depth of 34.9 km.

What is the deepest sea in the world?

The Mariana Trench, in the Pacific Ocean, is the deepest location on Earth.

How do tectonic plates cause earthquakes?

The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth’s crust and cause the shaking that we feel.