Which of the following is a variable gas in our atmosphere

a.

Argon

b.

Oxygen

c.

Nitrogen

d.

Water vapor

e.

All of the above are correct

What was the first state to pass a law requiring the use of safety belts in automobiles?

Based on current rates the earths human population is expected to grow how much by 2050

How does proximity to the ocean moderate air temperature on a daily and annual basis?

Two locations are at the same latitude in the temperature zone. One is in the middle of the continent. The other is on a coast affected by the warm ocean current. How will their climates differ?

Where is the largest reservoir of carbon?

Why is Dubai creating underwater resorts and reclaimed islands? Dubai has an incredible amount of money to spend on building projects. Dubai's population is growing at a very fast pace, some say too fast.

Where was the maya civilization located

The widespread presence of banana plantations in central america region has resulted in increased standard of living

Which of these has been the result of human activity? a) glaciers melt more b) volcanoes erupt more landslides happen more d) earthquakes happen more

Which types of stars have extremely intense gravitational and magnetic fields?