How pressure changes with depth and height

Why do mountain climbers need oxygen masks at high altitudes?

• Because it's colder at high altitudes

• Because the air is thinner and has less oxygen

• Because they need to carry extra weight

• Because they need to see better

What happens to air pressure as you go higher in the atmosphere?

• It disappears

• It increases

• It stays the same

• It decreases

Why is air pressure higher at sea level?

• Because there are more air particles above

• Because the air is warmer

• Because the air is cleaner

• Because the air is moving faster

Why are water dams built thicker at the bottom?

• To withstand higher water pressure

• To look stronger

• To hold more water

• To be more stable

What is a risk for divers when they come up too quickly?

• They might get the bends

• They might get lost

• They might get too cold

• They might run out of air