Oxygen in atmosphere has been formed by:

Name the first oxygenic photoautotrophic organism. What was the effect of evolved oxygen on atmospheric gases of reducing atmosphere of that period ?

Coal has been mainly formed by

Coal has been mainly formed by

Coal has been mainly formed by

Coal has been mainly formed by

How ozone is formed from atmospheric oxygen in the atmosphere/ What is the use of it in the atmosphere?

Assertion:After the appearance of oxygen in the atmosphere, methane and ammonia began to disappear. Oxygen is involved in forming ozone layer.

(a) What are forms of oxygen found in the atmosphere? (b) forests influence the quality of our air soil and water resources. Justify the statement.

It has been recorded that the temperature of the earth's atmosphere has in creased by 0.6^(@)C . a. What has caused this increase ? b. Explain its consquences.