What is the cause of the “red tide”?
a large oil or gasoline spill gives the water its reddish color
the blood from fish or other marine animal in a massive “die-off”
a sudden growth spurt or “bloom” in algae
a toxic condition of the water cause by beach pollution

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

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