If magma is removed from great depths and used to make the volcanoes, is there a void (hole) beneath the island?
No. There is no “hole” beneath the island due to magma withdrawl. Yes, liquid rock is removed. Magma is derived from a layer in the earth called the mantle. Around the Pacific Ocean basin is a ring of subduction zones, called the Ring of Fire, where oceanic plates are pushed beneath continents. The oceanic plates are assimilated back into the mantle and flow or convect laterally and vertically. Some mantle probably resupplies the plume beneath Hawai`i. Think of it as a global system of supply and demand. Also the “flow” is of a solid and is at a very gradual rate, maybe millimeters per year. The concept of a solid that flows might seem strange. Think of stacking bricks on an asphalt driveway on a hot summer day. If you return hours later the bricks will have sunk down an inch (few cm) or so. In actuality the asphalt flows laterally from beneath the bricks in response to their weight. If you don’t want to damage your driveway, watch toothpaste as it comes out of the tube. It is another
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