Earth Science questions, help please?

person

New member
1. The behavior of earthquake waves indicate that as depth in the Earth increases, the density generally... decreases, increases, or remains the same?

2. The most destructive aspect of submarine earthquakes is the production of...... offshore trenches, longshore currents, giant sea waves along shores, or rip tides?

3. Seismic studies of the moon have helped scientists make inferences about... water erosion on the Moon, weathering on the Moon's surface, radioactivity of the Moon's surface rocks or the Moon's interior?

Thanks so much to those who help out.
Also:

According to the theory of Plate Tectonics, the distance between two continents on opposite sides of a mid-oceanic ridge will generally....

A). decrease
B). increase
C). remain the same
 
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