(a) 2.
The diagrams below show the patterns produced on an oscilloscope by three
different sound waves.
M
А
B
с
(0)
Which two waves have the same loudness?
Write the letters.
and

climate change and pollution

the answers are a and c

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.