earth​ ​and​ ​atmospheric​ ​science

Question 1

how was the early atmosphere formed

Answer 1

There​ ​was​ ​intense​ ​volcanic​ ​activity​ ​that​ ​released​ ​gases​ ​that​ ​formed​ ​the​ ​early atmosphere

Question 2

how did volcanoes add to the early atmosphere

Answer 2

Volcanoes​ ​also​ ​produced​ ​nitrogen​ ​which​ ​gradually​ ​built​ ​up​ ​in​ ​the atmosphere​ ​&​ ​there​ ​may​ ​have​ ​been​ ​small​ ​proportions​ ​of​ ​methane​ ​(CH4​ )​ and​ ​NH3

Question 3

what was the early atmosphere thought to have contained

Answer 3

● Little​ ​or​ ​no​ ​oxygen
● A​ ​large​ ​amount​ ​of​ ​CO2​
● Water​ ​vapour
● Small​ ​amounts​ ​of​ ​other​ ​gases

Question 4

how did water vapour form oceans

Answer 4

Water​ ​vapour​ ​condensed​ ​to​ ​form​ ​the​ ​oceans

Question 5

how was co2 decreased in the atmosphere as oceans were created

Answer 5

CO2​ ​​ ​dissolved​ ​in​ ​the​ ​water​ ​and​ ​carbonates​ ​were​ ​precipitated​ ​producing sediments,​ ​reducing​ ​the​ ​amount​ ​of​ ​CO2​ ​​ ​in​ ​the​ ​atmosphere

Question 6

how did the amount of O2 in the atmosphere increase

Answer 6

Algae​ ​&​ ​plants​ ​produced​ ​the​ ​O​2​​ ​that​ ​is​ ​now​ ​in​ ​the​ ​atmosphere​ ​by​ ​photosynthesis and decreased​ ​the​ ​%​ ​CO​2​​ ​in​ ​the​ ​atmosphere​ ​by​ ​photosynthesis

Question 7

what is the chemical test for O2

Answer 7

Uses​ ​a​ ​glowing​ ​splint​ ​inserted​ ​into​ ​a​ ​test​ ​tube​ ​of​ ​the​ ​gas and if the splint relights, the gas is oxygen

Question 8

how do various gases absorb heat radiated from the eart

Answer 8

electromagnetic radiation from the sun passes into the earths atmosphere. the earth absorbs some radiation, warming up (essential for life on earth) but some of this heat is radiated as infrared radiation which is absorbed by green house gases in the atmosphere. this eventually warms up the atmosphere leading to the greenhouse effect and global warming