The correct symbol of nitrogen is

• N₂

• O₂

• CO₂

• H₂O

The correct symbol of carbon dioxide is

• N₂

• O₂

• CO₂

• H₂O

The atmosphere is like

• a blanket

• shield

• oxygen

• sphere

What's the correct spelling "SPRHEATMOE"

The correct symbol of oxygen is

• N₂

• O₂

• CO₂

• H₂O

The atmosphere rises for more than ...... km

The correct symbol of water is

• N₂

• O₂

• CO₂

• H₂O

Which of these statements is correct:

• Air pressure is high at the top of a mountain.

• Air pressure is high at sea level.

• Air pressure is low at the top of a mountain.

• Air pressure is low at sea level.

Which of these gases is the one that exists in the largest amount in the atmosphere?

• N₂

• O₂

• CO₂

• H₂O

Gravity can't pull down the air particles.

• True

• False