Plates<span> at our planet's surface </span>move<span> because of the intense heat in the Earth's core that causes molten rock in the mantle layer to </span>move<span>. It </span>moves<span> in a pattern called a convection cell that forms when warm material rises, cools, and eventually sink down.
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Cinder cones are the simplest type of volcano. They are built from particles and blobs of congealed lava ejected from a single vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone.
The midpoint of (-4,-2) and (3,3) is (-.5,.5) or (-1/2,1/2).