Answer: Molten materials
The convection can be defined as the heat transfer in liquid. The liquid inside the earth moves in a circular motion and in this way heat transfer takes place.
The hotter liquid moves up and the cold liquid takes place of the hotter particles and it looks exactly like a circular movement of liquids.
The movement of molten material is driven by the heat inside the earth.
The answer is B. It is B because in if convection currents cooled down then the earth would die.
Correct answer is "Fish"
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The continent was relatively flat before glaciers started carving deep valleys 34 million years ago, a new study finds. Like Alaska's mighty Yukon, a broad river once flowed across Antarctica, following a gentle valley shaped by tectonic forces at a time before the continent became encased in ice.
Hardness of a mineral is defined as the resistance to breaking, and density is defined as the mass of a substance per unit volume.
The density and hardness of a mineral, that is formed from through metamorphism are relatively much harder because the metamorphic minerals are formed under extremely high temperature and pressure conditions. These are high-grade minerals.
On the other hand, the density and hardness of a mineral formed through evaporation are much weaker in nature, because these minerals are formed when the water is eliminated due to the high rate of evaporation.
So, it can be concluded that the density and hardness of as mineral formed through the metamorphic process is highly stronger and harder than those that are formed through evaporation.