Which statement is correct about the movement of plates that sit on top of the mantle? (1 point)
Responses
They regularly move because of the convection currents of oceans.
They regularly move because of the convection currents of oceans.
They regularly move because of the convection currents of magma.
They regularly move because of the convection currents of magma.
They never move because they are connected to Earth’s crust.
They never move because they are connected to Earth’s crust.
They never move because they are connected to mountains.
The correct statement is:
They regularly move because of the convection currents of magma.
Which statement is correct about the flow of thermal energy inside Earth?(1 point)
Responses
Energy flow inside the crust causes magma to rise.
Energy flow inside the crust causes magma to rise.
Energy flow inside the mantle causes magma to rise.
Energy flow inside the mantle causes magma to rise.
Energy flow inside the crust causes magma to sink deeper.
Energy flow inside the crust causes magma to sink deeper.
Energy flow inside the mantle causes magma to sink deeper.
Energy flow inside the mantle causes magma to sink deeper.
The correct statement is:
Energy flow inside the mantle causes magma to rise.
Which is a result of boundary plates colliding or sliding past each other? (1 point)
Responses
valleys form
valleys form
volcanoes erupt
volcanoes erupt
earthquakes occur
earthquakes occur
mountains form
The correct response is:
mountains form
The correct statement about the movement of plates that sit on top of the mantle is:
- They regularly move because of the convection currents of magma.
To understand why this statement is correct, we need to look at the process of plate tectonics. The Earth's lithosphere, which consists of several large and small pieces of crust called tectonic plates, sits on top of the semi-fluid layer of the mantle. The mantle has convection currents, which are circular movements of heat and material due to differences in temperature.
When the mantle heats up, it becomes less dense and rises towards the surface, while the cooler, denser portions sink back down. This creates convection currents in the mantle. These convection currents are the main driving force behind the movement of tectonic plates.
As the hot mantle rises beneath a tectonic plate, it pushes the plate away, leading to the separation of plates at divergent boundaries. Conversely, at convergent boundaries, where two plates collide, the denser plate sinks into the mantle, driven by the force of the convection currents.
Therefore, the movement of the tectonic plates is neither due to convection currents in the ocean nor because they are connected to the Earth's crust or mountains. It is primarily caused by the convection currents of magma in the mantle.