233018 What fraction of the Sun's heat does earth receive?
1 in 2,000,000,000
233019 Which of the following can be defined as the pressure exerted by the weight of air on the earth’s surface?
Air Pressure
233020 Percentage of oxygen in the earth's atmosphere is __________.
21% According to NASA, the gases in Earth's atmosphere include: Nitrogen — 78 percent. Oxygen — 21 percent. Argon — 0.93 percent.
233021 What is the average height of the troposphere?
13km
