Which stimuli is detected by a chemoreceptor?

Explanation:

The chemoreceptor is a type of sensory receptor that detects and changes chemical material into biological signals.  Generally, this receptor detects toxic chemicals in internal as well as from the external environment and sends the information to CNS. Generally, chemoreceptors are classified into two groups one is called distance chemoreceptors such as olfactory receptor neurons and the other is called direct chemoreceptors such as the taste receptor of the gustatory system.  

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.