What are the 4 eras of early earths history?

What are 4 eras of environmental history in the US?

Tribal Era (Agricultural Revolution) Frontier Era (Lets conquer the wilderness) Early Conservation Era (lets preserve the wilderness) Environmental Era (60s- science, 70s- regulation, 80s- business)

What are the four major eras of earths history?

1. Precambrian Era (earliest forms of life, such as bacteria and blue-green algae; later in the period, invertebrates such as jellyfish).2. Paleozoic Era (Pangaea; invertebrate life, such as trilobites, later in the era, followed by development of vertebrates, including fish; development of vertebrates, amphibians, and the beginnings of reptiles; development of simple plants, such as mosses and ferns)3. Mesozoic Era (Pangaea separates into continents; "Age of Reptiles"; dinosaurs, flowering plants, small mammals and birds)4. Cenozoic (Present Era) Ice Age; mammoths; gradual development of mammals, birds and other animals recognizable today; humans; flowering plants, forests, grasslands.)Edit:Actually the above answer can be disputed. The Precambrian is not considered an era, it is considered a supereon that is divided into three eons. Two of these eons are subdivided into a total of seven eras. Combine that with the three eras of the Phanerozoic Eon, and you have ten.So this question doesn't really make sense, considering there are actually ten eras.

What are 4 obstacles to early exploration?

diseases poor navigation fear of the unknown no medicaine bad ships

What are the four phases of the earth's history?

Who had the Biggest empire in history?

Britain did, holding over 1/4 of the total land mass, 'The British Colonial Empire'

What are the 4 eras in earths history?

precambrian era, paleozoic era, mesozoics era, cenozoic era

What are the prehistoric eras?

There are so far 4 Eras in the earths history. the one that started the beginning if the earths history: Precambrian Time. The one after that was the Paleozoic Era, which means "ancient life." next was mesozoic which means "middle life" the one we are in is called the Cenozoic Era which means" recent life." * All Eras ended with a mass extinction.

Who divided Media history into 4 eras?

Denis McQuail

What are the three eras of geologic time?

There are 4 eras, and they are the Hadean, Archean, Proterozoic, and Phanerozoic eras.

What are 4 eras of environmental history in the US?

Tribal Era (Agricultural Revolution) Frontier Era (Lets conquer the wilderness) Early Conservation Era (lets preserve the wilderness) Environmental Era (60s- science, 70s- regulation, 80s- business)

How many eras make up the geologic time scale?

Four eras. that is Cenozoic,mesozoic,paleozoic and precambrian

Which eon did most of earths history occur in?

Most of Earth's history has occurred in the Precambrian Era, a time span of over 4 billion years.

How many eras has the earth had?

The Earth has had 4 eras. The Precambrian time, Paleozoic era, Mesozoic, and the era we are in now, the Cenozoic.