Mass extinctions occur for many reasons. Changes in the environment might make it impossible for the local life to survive, diesease or drought might strike, or there might be a natural disaster. These extinctions make good divisions in geologic time because they are easy to locate over a wide area and mark a definitive change in the Earth's systems.
Answer: water food oxogen
Explanation:
Boat, Fishing Equipment(spear), and irrigation
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.
The answer is True. In a convergent boundary, two tectonic plates collide as they move in opposite directions, and there is a subduction zone where there are deep trenches. As the heavier tectonic plate, mostly the oceanic plate, is subducted, it enters the mantle and begins to melt. This makes magma that rises and erupts into a volcano in the overlying continental plate. This is how the Andes Mountains were formed.
