An acute infection causing fever and convulsions with tonic spasms of skeletal muscles is called:

Tetanus

Tetanus is an acute bacterial infection caused by the Clostridium tetani bacterium. It is characterized by muscle spasms. The bacteria enter the body through a deep cut or wound. The early symptoms of this infection include diarrhea, fever, and headache. Other symptoms include sweating and rapid heartbeat.

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.