Question

In groups,discuss the answers to the following questions.
a.What happened about 4,6 billion years ago?
b.How were mountains and ocean beds formed?
c.Due to what process did the first animals appear?

Answer 1

1.Earth began to form over 4.6 billion years ago from the same cloud of gas (mostly hydrogen and helium) and interstellar dust that formed our sun, the rest of the solar system and even our galaxy. 2.Movements of tectonic plates create volcanoes along the plate boundaries, which erupt and form mountains The deep basins under the oceans are carpeted with lava that spewed from submarine volcanoes and solidified 3.Between 620 and 550 million years ago (during the Vendian Period) relatively large, complex, soft-bodied multicellular animals appear in the fossil record for the first time. While found in several localities around the world, this particular group of animals is generally known as the Ediacaran fauna, after the site in Australia where they were first discovered.