Geologists Use Explosives to Map the Subterranean

question 101

Multiple Choice

Geologists use explosives to map the subterranean.The times for the reflected waves to arrive at a monitoring station can tell a great deal about the composition of the rock structures.Suppose the time it takes for a wave that is reflected from the interface of (1) and (2) is 2 s,and the time for another wave that is reflected between (2) and (3) is 2.5 s and the speed of the wave in layer (1) is 6 km/s and in layer (2) is 4 km/s,how thick is layer (2) ?

• A)2 km
• B)1 km
• C)3 km
• D)6 km
• E)8 km

---

Definitions:

Reversibility

A mental operation in which a child realizes that one operation can be negated, or reversed, by the effects of another.

Reversibility

The cognitive ability to understand that actions can be reversed, returning to the original state.

Mental Operation

Cognitive processes that involve manipulating information mentally, such as reasoning, problem-solving, and decision-making.

Conservation-of-Volume Task

A cognitive development task used in developmental psychology to assess a child's understanding that the quantity of a substance remains unchanged even when its appearance changes.