The Earth's crust comprises about 95% igneous and metamorphic rocks, 4% shale, 0.75% sandstone, and 0.25% limestone. Oxygen, silicon, aluminum, and iron account for 88.1% of the mass of the Earth's crust, while another 90 elements make up the remaining 11.9%.
The flat Earth<span> model is an archaic conception of the Earth's shape as a plane or disk. </span>
We live now in an eon of 542 million years in which abundant animal and plant life has existed. It is the Phanerozoic eon. Therefore, the correct answer is B. Phanerozoic.
Answer:
James Watson and Francis Crick with their DNA model at the Cavendish Laboratories in 1953.
Explanation:
