i need help.
During the Precambrian time, the Earth's atmosphere lacked free oxygen, and the early atmosphere was likely composed of gases such as methane, ammonia, and carbon dioxide. Throughout the Precambrian, there were significant changes in atmospheric composition due to volcanic activity and the evolution of photosynthetic organisms that contributed oxygen to the atmosphere.
During the Precambrian time, the Earth's atmosphere underwent significant changes, transitioning from a reducing atmosphere dominated by gases like methane and ammonia to an oxidizing atmosphere with increasing levels of oxygen, due to the development of photosynthetic organisms. This increase in oxygen levels laid the foundation for the evolution of complex multicellular life forms.
The Earth's Precambrian atmosphere was primarily composed of carbon dioxide, methane, ammonia, and water vapor. It lacked oxygen and had higher levels of greenhouse gases compared to the present atmosphere. This environment supported the evolution of early life forms such as bacteria and algae.
Nitrogen (N2) - 78% Oxygen (O2) - 21%
Nitrogen and oxygen, respectively, are the two most abundant gases in the earth's atmosphere.
oxygen
precambrian era
The origin of free oxygen
During the Precambrian time, the Earth's atmosphere lacked free oxygen, and the early atmosphere was likely composed of gases such as methane, ammonia, and carbon dioxide. Throughout the Precambrian, there were significant changes in atmospheric composition due to volcanic activity and the evolution of photosynthetic organisms that contributed oxygen to the atmosphere.
During the Precambrian time, the Earth's atmosphere underwent significant changes, transitioning from a reducing atmosphere dominated by gases like methane and ammonia to an oxidizing atmosphere with increasing levels of oxygen, due to the development of photosynthetic organisms. This increase in oxygen levels laid the foundation for the evolution of complex multicellular life forms.
The Earth's Precambrian atmosphere was primarily composed of carbon dioxide, methane, ammonia, and water vapor. It lacked oxygen and had higher levels of greenhouse gases compared to the present atmosphere. This environment supported the evolution of early life forms such as bacteria and algae.
Nitrogen (N2) - 78% Oxygen (O2) - 21%
Nitrogen and oxygen, respectively, are the two most abundant gases in the earth's atmosphere.
Yes. Asteroids can enter earth's atmosphere. In such an event the asteroid will probably strike earth's surface.
Gas was lacking from Earth's early atmosphere in the early Precambrian era because the primitive atmosphere was composed mainly of hydrogen and helium, which were lost over time. The formation of the Earth's magnetic field and the development of the ozone layer prevented the atmosphere from being stripped away by solar winds, leading to the accumulation of gases like carbon dioxide and water vapor over billions of years.
Nitrogen and Oxygen are the two main constituents of air.
The Precambrian time