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Sagot :
Answers!
5. Label the diagram.
Convection current (arrow pointing up towards the mantle)
Moving toward (arrow pointing towards the left)
Moving apart (arrow pointing away from each other)
Expands and rises (arrow pointing up towards the mantle)
Cools and sinks (arrow pointing down towards the mantle)
Mantle (labeled as "Mantle" below the convection current)
6. Plates move apart where convection currents are rising.
7. Plates move toward each other where convection currents are sinking.
Explanation:
(5)
- - Convection current: The circular movement of hot magma in the mantle that drives the movement of tectonic plates.
- - Moving toward: Plates moving towards each other, often resulting in the collision and forming of mountains or trenches.
- - Moving apart: Plates moving away from each other, leading to the formation of new crust through seafloor spreading.
- - Expands and rises: Hot magma in the mantle expands due to heat and rises towards the surface, creating a convection current.
- - Cools and sinks: Cooler and denser magma in the mantle sinks back down as it loses heat, completing the convection cycle.
- - Mantle: The layer of Earth beneath the crust and above the core, consisting of hot solid rock that flows like a liquid over geological time scales under high pressure and temperature.
(6)
- Where convection currents are rising, plates move apart. This occurs as the hot magma from the mantle rises, pushing the tectonic plates away from each other. As the plates move apart, new crust is formed along mid-ocean ridges through seafloor spreading.
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(7)
- Where convection currents are sinking, plates move toward each other. The sinking of cooler, denser material in the mantle causes plates to move towards each other. This can result in the formation of subduction zones, where one plate is forced beneath another, leading to volcanic activity and the formation of mountain ranges.
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