Letter d represents a wave's a)crest b)trough c)wave height d)wavelength

B) trough

Explanation:

A) Crest is the top or the highest point of the wave.

B) Trough is the bottom or the lowest part of the wave.

C) wave height is the vertical distance between the crest and the trough.

D) Wavelength is the distance between two successive wave crests or wave troughs.

Thus letter A represents wavelength, letter B represents wave height, letter C represents crest and letter D represents trough.

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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.