Why are no rocks found that date from the first 800 million years of Earth's
existence?
A. All the rocks from that time period have been destroyed by plate
movements.
B. They have all been buried too deeply under newer rocks.
O C. Earth was too hot to have solid rocks at that time.
D. They were all destroyed by a comet impact.

Cpr, or cardiopulmonary resuscitation, is a first-aid technique to save lives. it involves compressions of the patient's chest cavity. which description is the best description of the functions of chest compressions in cpr? chest compressions are done to pump the heart. chest compressions are done to strengthen the rib bones. chest compressions increase carbon dioxide inhalation. chest compressions allow the patient's muscles to wake up.