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Precambrian Time
Precambrian Time is a unit of time that extends from 4.6 billion years ago to 542 million years ago. It is sometimes referred to as the age of early life. Precambrian Time had two climates that flipped back and forth. The first climate was Greenhouse Time. During Greenhouse Time there was little ice on either pole and there were warm temperate climates at higher latitudes. The second climate was called Icehouse Conditions. During Icehouse Conditions large sheets of ice covered at least one or both of the poles.
The Continents
500 million years after Earth's formation less dense rock at Earth's surface formed the continents. The largest landmass called Gondwana ( a collection of today's southern countries) is located in the right corner of the map at the bottom of the page labeled The Continents. The second largest landmass Laurentia is located in the southwest of the map. Siberia and Baltica are located in between the two largest landmasses.
Landforms
One major change to landforms in Precambrian Time is when the Continents formed 400 million years ago. Another major landform change during the Precambrian Time is 2.9 billion years ago when the oldest glaciation took place in South Africa with evidence provided by glacial deposits in Southern Africa. A third major landform changing event within Precambrian Time was 3.8 billion years ago when the worlds oldest rock formed from lava coming through cracks in the sea floor.
Major Changes To Living Things
One major change to a living thing during the Precambrian Time was when plants developed photosynthesis. Another major change to a living thing took place 600 million years ago when the first multicelled animal appeared in the fossil record, its name was the Ediacarans. A third major change to a living thing was at the end of the period during the Cambrian Explosion when soft bodied creatures appeared.
It was thought that the final stages of the Precambrian Time were marked by a global ice age which triggered a widespread of extinctions of other organisms.
Resources:
www.encyclopedia.com/topic/Precambrian-era.aspx
www.nature.nps.gov/geology/nationalfossilday//climate_change_earth_history.cfm
www.science.nationalgeographic.com/science/prehistoric-world/precambrian/
www.scienceforkids.kidipede.com/biology/animals/chordates/fish/lungfish.html
Precambrian Time is a unit of time that extends from 4.6 billion years ago to 542 million years ago. It is sometimes referred to as the age of early life. Precambrian Time had two climates that flipped back and forth. The first climate was Greenhouse Time. During Greenhouse Time there was little ice on either pole and there were warm temperate climates at higher latitudes. The second climate was called Icehouse Conditions. During Icehouse Conditions large sheets of ice covered at least one or both of the poles.
The Continents
500 million years after Earth's formation less dense rock at Earth's surface formed the continents. The largest landmass called Gondwana ( a collection of today's southern countries) is located in the right corner of the map at the bottom of the page labeled The Continents. The second largest landmass Laurentia is located in the southwest of the map. Siberia and Baltica are located in between the two largest landmasses.
Landforms
One major change to landforms in Precambrian Time is when the Continents formed 400 million years ago. Another major landform change during the Precambrian Time is 2.9 billion years ago when the oldest glaciation took place in South Africa with evidence provided by glacial deposits in Southern Africa. A third major landform changing event within Precambrian Time was 3.8 billion years ago when the worlds oldest rock formed from lava coming through cracks in the sea floor.
Major Changes To Living Things
One major change to a living thing during the Precambrian Time was when plants developed photosynthesis. Another major change to a living thing took place 600 million years ago when the first multicelled animal appeared in the fossil record, its name was the Ediacarans. A third major change to a living thing was at the end of the period during the Cambrian Explosion when soft bodied creatures appeared.
It was thought that the final stages of the Precambrian Time were marked by a global ice age which triggered a widespread of extinctions of other organisms.
Resources:
www.encyclopedia.com/topic/Precambrian-era.aspx
www.nature.nps.gov/geology/nationalfossilday//climate_change_earth_history.cfm
www.science.nationalgeographic.com/science/prehistoric-world/precambrian/
www.scienceforkids.kidipede.com/biology/animals/chordates/fish/lungfish.html