GENERAL GEOLOGY

GEOLOGY

GEOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Trenches are formed where
A
a plate splits and creates a rift
B
sea-floor spreading takes place
C
a plate sinks below another
D
a plate is lifted by another
Explanation: 

Detailed explanation-1: -In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.

Detailed explanation-2: -Subduction zones can be found at convergent boundaries between two tectonic plates in the Earth’s crust. Converging plates cause part of the Earth’s crust to sink beneath the ocean floor and into the mantle, forming a deep trench.

Detailed explanation-3: -Trenches are long, narrow depressions on the seafloor that form at the boundary of tectonic plates where one plate is pushed, or subducts, beneath another.

Detailed explanation-4: -A subduction zone is a region in which a portion of a tectonic plate sinks beneath another plate into the Earth’s interior. Subduction zones are defined by deep oceanic trenches, lines of volcanoes parallel to the trenches, and zones of large earthquakes that extend from the trenches landward.

Detailed explanation-5: -Oceanic crust tends to be denser and thinner than continental crust, so the denser oceanic crust gets bent and pulled under, or subducted, beneath the lighter and thicker continental crust. This forms what is called a subduction zone.

There is 1 question to complete.