Which of the following is true of the Earth's glacial history?
A) The Earth's climate has remained relatively consistent throughout geologic time.
B) An episode of widespread glaciation at the end of the Proterozoic resulted in the Great Oxygenation Event.
C) There was a time called Snowball Earth when the Earth's surface was almost entirely covered in glacial ice.
D) Increased glaciation at the end of the Cretaceous was partly responsible for the extinction of the dinosaurs.

Question

Quizplus · Accepted Answer

The idea of a "Snowball Earth" suggests that during the Cryogenian Period (approximately 720-635 million years ago), the Earth's surface was almost entirely covered in ice. The geological evidence for this includes sedimentary rocks with glacial deposits found in areas of the world where glaciation is unlikely today, and glacial scratches and striations found on rocks from this time period.

Which of the Following Is True of the Earth's Glacial