Coral limestone are examples of rocks whose formation is not explained by the rock cycle. Corals are tiny marine organisms that absorb carbon dioxide dissolved in sea water and use this to secrete hard skeletons of calcium carbonate. These organisms can build massive reef structures over the course of thousands of years.
Answer:
D. The Russian Revolution
Explanation:
The Soviet Union, whose official name was the Union of Soviet Socialist Republics, was founded in 1922 following the victory of the Bolsheviks in the Russian Revolution. The Revolution itself occurred in 1917 and resulted in the end of the period of the Russian Tsars. The Soviet Union played an important role in both World War II and the Cold War. After this latter conflict the USSR was dissolved and the former republics associated with it became independent nations.
I think the stratosphere but I am not positive...i could be wrong
The geologic time scale is divided into eons, eras, periods, and epochs (EHP-uhks). Unlike divisions of time such as days or minutes, the divisions of the geologic time scale have no fixed lengths. Instead, they are based on changes or events recorded in rocks and fossils.
