Early Earth

The earliest form of life known on Earth was...

• Leafy Plants

• Multi-celled Organisms

• Fossils

• Single-Celled Organisms

Earth seperated into layers based on

• gravity
• metallicity
• the tendency for material to recycle
• density

What is the estimated age of the Earth?

• 5.6 billion years

• 4.6 million years

• 4.6 billion years

• 13.8 billion years

Which of these is one of Earth's spheres?

• Bioshere

• Hydrosphere

• Geosphere

• All of the above

The earliest evidence of life was found in fossils dated____ years ago.

• 4.7 million

• 3.5 billion

• 4.8 billion

• 3.5 million

What were the first cells in the early earth?

• single cells with a nucleus

• single cells without a nucleus

• multi cells with a nucleus

• multi cells without a nucleus

During the time of early Earth, the least dense elements could be found ____________________

• near the core

• on the surface

• in the atmosphere

• on other planets

The atmosphere of the early Earth had all of the following gases EXCEPT _____________________

• carbon dioxide

• carbon monoxide

• oxygen

• water vapor

Which of the following is all correct names for periods of time in the Geologic Time Scale?

• Eon, Era, Period, Epoch

• Epoch, Events, Traces, Periods

• Period, Events, Fauna, Strata

• Eeny, Meeny, Miny, Moe

Which layer of the earth is the thinnest?

• Crust

• Mantle

• Inner core

• Outer core