Question

1.3.2 test (cst): science and engineering
question 14 of 25
which statement could be a scientific theory?

a. the movement of pieces of earths crust explains many geologic phenomena.

b. a variety of geologic phenomena have been occurring for billions of years.

c. earths crust varies in thickness between 10 and 70 km.

d. large pieces of earths crust move very slowly on its surface.

Explanation:

A scientific theory is a well - substantiated explanation of some aspect of the natural world that is based on a body of facts. Option A: The movement of pieces of Earth's crust (plate tectonics concept) explains many geologic phenomena. This is a broad explanation that ties together multiple geological observations. Option B is a statement about the time span of geologic phenomena, more of a fact about duration. Option C is a measurement fact about the Earth's crust thickness. Option D is a description of how the crust moves, a fact about the movement speed, not a comprehensive explanation. So the statement that could be a scientific theory is A.

Answer:

A. The movement of pieces of Earth's crust explains many geologic phenomena.