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How is atmosphere today different from atmosphere billions of years ago?
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How does the atmosphere composition today compare with the air 1000 years ago?
1000 years ago the air was much the same as it is today, with a little less CO2 and a little less pollution.
How long ago was big bang?
It is believed to have occurred 13.7 billion years ago.
Is there less oxygen today than 1000 years ago?
The atmosphere has the same amount of oxygen today as it did 1000 years ago. Although oxygen gets used up in various ways, through fire and through metabolism, oxygen is constantly being released into the atmosphere by green plants.
How far is a star?
Every star is a different distance from us. The nearest one is about 93 million miles. (That's the one called the "Sun".) The next nearest one is 4.3 light years from us. That's about 25,278,030,000,000 miles. (You can see why it's easier to use light-years than miles.) From there, there are billions and billions of stars, grouped in billions and billions of galaxies. The farthest ones we can see are about 14 billion light years away, but we're sure there are more that are farther away than that.
Can constellations disappear?
Over billions of years, maybe.
What was the primary factor missing for billions of years that was necessary for protists to evolve?
The primary factor that was missing for billions of years that was necessary for protists to evolve was oxygen in the atmosphere. Billions of years ago, the atmosphere was mostly made up of carbon dioxide, carbon monoxide, hydrogen, nitrogen, and water vapor.
What was the primary factor missing of billions of years that was necessary for protists to evolve?
The primary factor that was missing for billions of years that was necessary for protists to evolve was oxygen in the atmosphere. Billions of years ago, the atmosphere was mostly made up of carbon dioxide, carbon monoxide, hydrogen, nitrogen, and water vapor.
What was the primary factor missing for billions of years that's was necessary for protists to evolve?
The primary factor that was missing for billions of years that was necessary for protists to evolve was oxygen in the atmosphere. Billions of years ago, the atmosphere was mostly made up of carbon dioxide, carbon monoxide, hydrogen, nitrogen, and water vapor.
Starting billions of years ago algae lowered the?
...lowered the level of CO2 in the atmosphere and released O2
What is locked up' carbon?
Carbon dioxide that has been taken out of the atmosphere and trapped inside oceans, sedimentary rocks, volcanoes etc. from billions and billions of years ago :)
Seas could not form billions of years ago until?
The atmosphere relieved itself of moisture in the form of rain.
What is locked up carbon dioxide?
Carbon dioxide that has been taken out of the atmosphere and trapped inside oceans, sedimentary rocks, volcanoes etc. from billions and billions of years ago.
What is the primary factor missing for billions of years that was necessary for protists to evolve?
The primary factor missing for billions of years that was necessary for protists to evolve was atmospheric oxygen. In order to grow and evolve, protists needed oxygen at a time when there was little in the atmosphere.
Was the earth's atmosphere always the same?
No, actually it took a period of about 2.5 billion years for the atmosphere to be were it is today.
How did earth come to have an oxygen rich atmosphere?
Algae activity
How did earth get an oxygen filled atmosphere billions of years ago?
Cyanobacteria carried out photosynthesis, turning water and carbon dioxide into carbohydrates and oxygen.
Was there life in the solar system billions of years ago?
It is quite possible. Billions of years ago, the Sun was a lot cooler. Life may well have existed on Venus because of this. However, because of changes in the atmosphere - a severe global warming, any life that did exist, perished. For low values of "billions," the answer is definitely yes, as there are fossils from life on Earth from two billion years ago.
