An atom of hydrogen and an atom of carbon are

Which of the following are causes of coastal erosion? check all that apply. beach grasses and other plants trap windblown sand. wave action carves away the coastline. groundwater under pressure is forced to earth’s surface. artificial structures stop the natural flow of sand along the coast. underground caves collapse as bedrock is dissolved.

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above