Elementary School: 1st and 2nd Grade - Science - The Earth And Its Atmosphere Solution

Q.1.

Which was thought to be the most abundant gas in the Earth's early atmosphere?

Q.2.

Carbon dioxide entered the early atmosphere when it was released from...

Q.3.

The percentage of water on the planet did NOT increase due to...

Q.4.

Which of the following gasses is thought NOT to have been present in the early atmosphere?

Q.5.

Oxygen started to appear on Earth due to what organisms?

Q.6.

What process produces oxygen as a waste product?

Q.7.

Which of the following is NOT a reason for the small percentage of carbon dioxide in the Earth's atmosphere today?

0%
Some carbon dioxide has dissolved in the oceans
0%
Carbon dioxide has been used to form sedimentary rocks
0%
Some carbon dioxide has been locked up in fossil fuels
0%
There has always only been a small amount of carbon dioxide in the atmosphere

Q.8.

At one time in the Earth's formation, some of the surface iron was oxidized. What gas in the atmosphere could NOT have caused this change?

Q.9.

Which of the following developments is NOT as a result of concerns about carbon dioxide levels and global warming?

Q.10.

The change in carbon dioxide concentration in the last 50 years is thought to be a result of...