Why do convergent boundaries cause the formation of volcanoes?
Responses
When two plates move away from each other, the crust gets thinner. This allows magma to shoot out onto the surface of the crust and harden.
When two plates collide, part of one plate is broken. This creates an area where the mantle is exposed to the air and magma shoots out onto the crust.
When two plates move away from each other, they create a crack in the crust, or a fault. This fault can go all the way to the mantle, causing magma to shoot out onto the crust.
When two plates collide, one goes under the other. This creates an area of high pressure, which causes mantle rock to melt into magma and shoot out onto the crust.
When two plates collide, the denser oceanic plate is subducted under the lighter continental plate. As it is pushed deeper into the mantle, the subducted plate heats up, causing the rock to melt and form magma. This magma then rises to the surface and creates a volcano. Additionally, the collision creates a zone of intense pressure and friction, which can also lead to the formation of magma and volcanic activity.
Acidic water is known to react with the substances in limestone, breaking it down. What is this process called?
Responses
tectonic uplift
volcanism
weathering
erosion
Weathering.
The correct answer is:
When two plates collide, one goes under the other. This process is known as subduction. As the denser plate is forced beneath the other plate, it sinks into the mantle. The immense pressure and temperature in the subduction zone cause the mantle rock to partially melt, forming magma. This magma is less dense than the surrounding solid rock, so it rises towards the surface. Eventually, it can break through cracks in the overlying plate and erupt onto the Earth's surface, forming a volcano.
To determine the reason for the formation of volcanoes at convergent boundaries, we need to consider the process of subduction.