The Earths Transitions
1. What transitions has Earth gone through and why?
The young earth was anything but habitable. Radioactive elements decaying within its mass and impacts from debris raining down form space generated intense heat. There was no life during this era. Is called the Hadean era and was formed about 4.5 billion years ago. Hadean comes from the Greek word Hades which means “Hell”. That’s how hot the Earth’s temperature was.
The next phase in the Earth’s history was the Archean era. It existed from about 2.5 to 3.8 billion years ago. This was the first time that any rock development was discovered.
Next was the Proterozoic era. It dated .6 to 2.5 billion years ago. During this era the Earth became frozen and it is also known as the Snowball Earth. Shortly after the Snowball Earth period, the first eukaryotic cells evolved. All life during this time period was single celled. These three eras were known as Precambrian.
The Paleozoic time period was next and dated about .5 billion years ago. It was broken into several different categories. Permian, which included another near extinction of life. It’s possible that maybe many volcanoes erupted causing a greenhouse effect. It killed 80-85% of all life forms. Then there was the Pennsylvanian, Mississippian, Devonian, Silurian, Ordovician, and Cambrian time periods. The Cambrian Explosion is when most life forms were discovered.
The next period was the Mesozoic era. It is dated about 66.4 to 245 million years ago. It was also broken into categories: Critaceous, Jurassic and Triassic. During the Triassic time period dinosaurs existed. This was another time that the Earth became extinct due to a possible meteorite.
The final time period of the Earth’s history is the Cenozoic era. It is when human life was discovered and is dated from the present to 66.4 million years ago.
2. What can cause the dynamic balance in the atmosphere to change and what influence do humans have?
Things
The young earth was anything but habitable. Radioactive elements decaying within its mass and impacts from debris raining down form space generated intense heat. There was no life during this era. Is called the Hadean era and was formed about 4.5 billion years ago. Hadean comes from the Greek word Hades which means “Hell”. That’s how hot the Earth’s temperature was.
The next phase in the Earth’s history was the Archean era. It existed from about 2.5 to 3.8 billion years ago. This was the first time that any rock development was discovered.
Next was the Proterozoic era. It dated .6 to 2.5 billion years ago. During this era the Earth became frozen and it is also known as the Snowball Earth. Shortly after the Snowball Earth period, the first eukaryotic cells evolved. All life during this time period was single celled. These three eras were known as Precambrian.
The Paleozoic time period was next and dated about .5 billion years ago. It was broken into several different categories. Permian, which included another near extinction of life. It’s possible that maybe many volcanoes erupted causing a greenhouse effect. It killed 80-85% of all life forms. Then there was the Pennsylvanian, Mississippian, Devonian, Silurian, Ordovician, and Cambrian time periods. The Cambrian Explosion is when most life forms were discovered.
The next period was the Mesozoic era. It is dated about 66.4 to 245 million years ago. It was also broken into categories: Critaceous, Jurassic and Triassic. During the Triassic time period dinosaurs existed. This was another time that the Earth became extinct due to a possible meteorite.
The final time period of the Earth’s history is the Cenozoic era. It is when human life was discovered and is dated from the present to 66.4 million years ago.
2. What can cause the dynamic balance in the atmosphere to change and what influence do humans have?
Things