The _layer or earth's surface is called the
which consists of
The
layer or earth's surface is called the
_ which consists mostly of
and
The earth has an inner
that is
and is

The outer layer or earth's surface is called the

crust which consists of cool rock

about 40,000,000 results (0.81 seconds)  

search results

what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.