precambrian time
PRECAMBRIAN TIME
The Precambrian is a huge piece of earths history. It began 4.6- 543 mya. Also known as the “age of early life.” The climate changed a lot during the Precambrian. Warm and cold periods took place at the end of of the Precambrian. Almost all the continents were connected. Half of the continents were above the equator and half below. Looks like a 4 with a stand. Glaciers formed at and near the equator. Oldest rocks were dated back to 3.8 bya. Rocks formed from lava raising from cracks in the ground. Oxygen comes down to earth 2.5 bya the ozone layer forms, and protects the earth from solar radiation. Earth cools and water vapor collects in holes to form the oceans. Earliest organisms were microscopic bacteria. The bacteria uses photosynthesis for energy from the sun, this leads to plants. The first multi celled organisms were Ediacarans. Ediacarans are organisms that have tubes and is front shaped. At the end of the period the first multi celled organisms appear, sea and oxygen levels change, algae and soft bodied animals go extinct. There was also a global ice age. The precambrian was the major change to the land ocean and life.
The Precambrian is a huge piece of earths history. It began 4.6- 543 mya. Also known as the “age of early life.” The climate changed a lot during the Precambrian. Warm and cold periods took place at the end of of the Precambrian. Almost all the continents were connected. Half of the continents were above the equator and half below. Looks like a 4 with a stand. Glaciers formed at and near the equator. Oldest rocks were dated back to 3.8 bya. Rocks formed from lava raising from cracks in the ground. Oxygen comes down to earth 2.5 bya the ozone layer forms, and protects the earth from solar radiation. Earth cools and water vapor collects in holes to form the oceans. Earliest organisms were microscopic bacteria. The bacteria uses photosynthesis for energy from the sun, this leads to plants. The first multi celled organisms were Ediacarans. Ediacarans are organisms that have tubes and is front shaped. At the end of the period the first multi celled organisms appear, sea and oxygen levels change, algae and soft bodied animals go extinct. There was also a global ice age. The precambrian was the major change to the land ocean and life.