Early Atmosphere and Oceans

How do scientist think that early atmosphere was probably formed?

• Gases from volcanoes

• Lava from volcanoes

• Gases released from bacteria

• They are unsure how it is formed

Where do scientist thing the water from the oceans came from?

• Plants

• Dinosaurs

• Comets

• Rain

True or False: The first organisms in the ocean did not use oxygen.

• True

• False

Which gas did organisms in the sea take out of the air?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Sulfer

Modern day atmosphere has approximately what percentage of the air is Oxygen ?

• 1%

• 21%

• 78%

• 52%

What two gasses was the Earth's first atmosphere made of?

• oxygen and nitrogen

• oxygen and carbon dioxide

• hydrogen and oxygen

• hydrogen and helium

Volcanic "outgassings" provided sources of

• water vapor

• carbon dioxide

• nitrogen

• all of the answer choices

True or False: All of the gasses that formed the early atmosphere came entirely from volcanic eruptions.

• True

• False

The Earth's Second Atmosphere was formed from

• volcanoes and comets

• volcanoes and earthquakes

• meteorites and comets

• plants and meteorites

How did oxygen get in the atmosphere if there were no organisms to perform photosynthesis?

• rain droplets had oxygen

• volcanoes started releasing oxygen

• sunlight split water molecules

• oxygen came from comets