The condition resulting in muscle spasms of the nerves and muscles due to an abnormally low concentration of calcium in the blood is

The condition resulting in muscle spasms of the nerves and muscles due to an abnormally low concentration of calcium in the blood is called Hypocalcemia.

Hypocalcemia is also called neuromuscular irritability. In this condition the nerves and muscles,that are directly related to blood calcium levels, may spasm or twitch.

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.