What is the frequency of ocean waves that have a speed of 18 m/s and a wavelength of 50 m?
OPTIONS:
- 0.18 Hz
- 0.36 Hz
- 2.8 Hz
- 9.0 Hz

0.36 Hz

A layer of solid brittle rock comprises the outer 100 kilometers of Earth. This layer, which contains both the crust and the upper mantle, is called the
OPTIONS:
- core.
- sediment.
- lithosphere.
- hemisphere.

lithosphere.

When igneous rock is changed into metamorphic rock, which form of energy is this process?
OPTIONS:
- heat
- chemical
- magnetic
- light
heat