The sun! The water cycle is driven primarily by the energy from the sun.
current literacy rate of China is 96.8%
Answer:
A primary source is a document, first-hand account, or other source that constitutes direct evidence of an object of study.Examples of a primary source are: Original documents such as diaries, speeches, manuscripts, letters, interviews, records, eyewitness accounts, autobiographies.
When sedimentary rocks are subjected to heat and pressure without being melted, they become metamorphic rocks. Also, higher pressures and higher temperatures cause the formation of new minerals. There is heat from pressure inside the earth. There is also heat coming from radioactive decay.
Answer:
D. The study of the earth's surface.
