C11 History of the Earths Atmosphere & Today's Atmosphere

When was the Earth's atmosphere formed

• 4.6 billion years ago

• 4.6 million years ago

• 46 billion years ago

• 46 million years ago

On theory suggests that volcanoes released what gas/gases

• water vapour

• carbon dioxide

• oxygen

• nitrogen

What theories are used to explain where water came from

• water vapour condensed as the Earth cooled

• water leaked out from the Earth's core

• icy comets rained down on the surface of the Earth

As the Earth stabilised, what was the main gas of the atmosphere

• methane

• nitrogen

• oxygen

• carbon dioxide

As the Earth stabilised, what other gases could have been present other than carbon dioxide?

• hydrogen

• water vapour

• nitrogen

• methane

• ammonia

What gas was there little to none in the early Earth's atmosphere?

• argon

• helium

• oxygen

• hydorgen

When do scientist believe that life started to form?

• 3.4 billion years ago

• 5.7 billion years ago

• 9.8 billion years ago

• 1 billion years ago

What were the first life forms on Earth

• weeds

• algea

• bacteria

• cockroaches

What did the simple organisms similar to bacteria evolve to

• tadpols

• algae

• ants

• seaweed

Approximately when did the evolution of simple organisms happen?

• 2.7 billion years ago

• 0.7 billion years ago

• 4.2 billion years ago

• 1.7 billion years ago