1. At which type of boundary does new oceanic crust form? 2. Why is this type of boundary also known as a constructive boundary?

1. the boundary that the ocean crust forms is the Divergent Boundary.

2. both these plates move apart and cause earthquakes.

Explanation:

1. these boundaries are known to crash against each other causing earthquakes, but these boundaries are also form the oceanic crust.

2. when they move apart they cause earthquakes and volcano's. an example of this is the Mid- Atlantic ridge.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.