Question

Почему в атмосфере долгое время не было кислорода?(кратко)

Answer 1

Начнём сначала:

По поводу возникновения атмосферы учёные выдвигают две гипотезы. Согласно первой гипотезе, атмосфера — газообразная выплавка первичного материала, когда-то покрывавшего расплавленную Землю. Большинство учёных придерживаются второй гипотезы, которая утверждает, что атмосфера является вторичным образованием, возникшим при освобождении газообразных химических элементов и соединений из расплавленного вещества.

Как нам известно, источником газообразных веществ, из которых состояла первичная атмосфера, были расплавленные горные породы земной коры, мантии и ядра. Это говорит о том, что атмосфера возникла уже после того, как Земля разделилась на оболочки.
Следовательно, атмосферы на планете не было, потому что для этого нужно было время на естественные изменения на самой планете, а уже после чего началось формирование атмосферы!

Answer 2

Небыло озонового слоя который защищает от ультрофиолетовых лучей и сохраняет кислород

Answer 3

Why was there a lack of oxygen in the atmosphere for a long time?

The atmosphere of the Earth has not always contained a significant amount of oxygen. The presence of oxygen in the atmosphere is the result of a complex series of geological and biological processes that took place over billions of years. Here are some key factors that contributed to the lack of oxygen in the early atmosphere:

1. Formation of the Earth's Atmosphere: The Earth's atmosphere was initially formed through volcanic outgassing, which released gases such as water vapor, carbon dioxide, nitrogen, and methane.

2. Absence of Oxygen-Producing Organisms: In the early stages of Earth's history, there were no organisms capable of photosynthesis, which is the process by which oxygen is produced. Photosynthetic organisms, such as cyanobacteria, evolved much later and played a crucial role in increasing the oxygen levels in the atmosphere.

3. Chemical Reactions and Oxygen Sink: The early atmosphere contained gases that reacted with and consumed any oxygen that was produced. For example, oxygen reacted with iron in rocks and dissolved in the oceans, forming iron oxide minerals and other compounds. This process, known as chemical weathering, acted as a sink for oxygen, preventing its accumulation in the atmosphere.

4. Oxygen Production and Accumulation: Over time, as photosynthetic organisms evolved and became more abundant, they started producing oxygen as a byproduct of photosynthesis. Initially, the oxygen produced was consumed by chemical reactions and biological processes, such as the oxidation of organic matter. However, as photosynthetic organisms continued to thrive and produce more oxygen, the balance shifted, leading to the accumulation of oxygen in the atmosphere.

It is important to note that the process of oxygen accumulation in the atmosphere took millions of years and was not an instantaneous event. The rise of oxygen levels in the atmosphere, known as the Great Oxygenation Event, occurred around 2.4 billion years ago and had significant impacts on the evolution of life on Earth.