An earthquake sends out mechanical waves in all directions from its source. These waves travel through different materials in the Earth. Properties of a wave change when it moves from one material to another. What property of a wave changes as it moves from one material to another?

D, the answer is letter d. because even though fossil fuels take a very long time to form, they do form in the ground just like coal and others.

Ibelieve it is the 2nd answer, create gardens on all rooftops. let me know if this .

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!

D. a mountain abd are made by volcanos and tectonic plates