History Of The World

Question 1

Hadean Eon

Answer 1

Chaotic. Lasted 800 million years, Earth was bombarded by meteorites and there was severe volcanism. Ocean and atmosphere formed, crust stabilized.

Question 2

Archean Eon

Answer 2

1.3 billion years. Probably warm. Mostly methane and little oxygen in atmosphere. Most of planet was covered in ocean. Continent formation began. Sky was orange, profusion of volcanoes, sea was green, and shorelines were marked by stromatolites.

Question 3

Proterozoic Eon

Answer 3

1.9 billion years. Longest period. Oxygenation, origin and diversification of eukaryotes, multicellular animals, continental drift.

Question 4

Phanerozoic Eon

Answer 4

Modern Humans– divided into paleozoic, mesozoic, cenozoic

Question 5

Paleozoic Era

Answer 5

Marine life developed. Some developed shells. Land climate changed and land plants emerged. These plants possibly wound up as our coal deposits.

Question 6

Mesozoic Era

Answer 6

Formation of several continents. Great changes in life. Reptiles!
More continents broke up, many reptile groups ended up extinct.

Question 7

Cenozoic Era

Answer 7

Mountains were uplifted, and new life forms appeared. Warm-blooded animals, like marsupials and other primitive mammals roamed. Modern birds, deciduous trees. Humans left marks on land.

Question 8

Ice Age

Answer 8

Pleistocene Epoch

Question 9

Human Progression

Answer 9

Holocene Epoch

Question 10

Pre-Cambrian

Answer 10

88% of time span.