Question

Which is used to determine earthquake risk

A. Changes in the color of rocks near faults

B. Hydrogen gas emissions near fractures

C. The height of ocean waves

D. Strain in rocks near faults

Answer 1

The answer is C. The height of ocean waves

Because usually when there will be an earthquake, one of the signs is the wave of seawater rises than usual. This is also a sign of a tsunami.

Step-by-step explanation:

The most common cause of tsunamis is underwater earthquakes, especially those that occur in the subduction zone with a magnitude of 7.0 in the moment magnitude scale or more.

Refraction is the transformation of waves due to changes in seabed geometry. At the place where the narrowing occurs there will be a concentration of energy so that the wave height at that place will be enlarged.

Earthquakes usually occur near the confluence of continental plates and oceans in the deep sea, then spread to the shallower coast.

#AnswerForTrees

Answer 2

The option (b) ''Hydrogen gas emissions near fractures'' is the correct option.

Step-by-step explanation:

Hydrogen gas is highly mobile and insoluble in the earth's water. It causes the mechanical changes in the crustal rocks due to its high mobility nature.

When it flows into the water, it reacts with water and forms hydrogen peroxide. The outflow of the charges causes electric current in the earth's crust. If it will continue emitting charges then it will cause EM pulses which will lead to the earthquake