Answer:
OPTION D
Explanation:
IT OUTLINES THE COOPERATION BETWEEN COUNTRIES FOR SCIENTIFIC RESEARCH
Earth's gravity pulls matter downward, toward its center. It pulls precipitation down from clouds and pulls water downhill.
The Volga is the longest river in Europe. It is also Europe's largest river in terms of discharge and drainage basin. The river flows through central Russia and into the Caspian Sea, and is widely regarded as the national river of Russia.
