Question

Read the sentence, identify the error and rewrite it correctly. At a height of 10 km (about 8 miles) above sea level, the concentration of oxygen is much lower about one fifth at sea level?​

Answer 1

.the concentarion of oxygen is much lower about one fifth of the sea level

Answer 2

At a height of 10 km (about 8 miles) above sea level, the concentration of oxygen is much lower about one fifth at sea level :

• The concentration of oxygen at sea level is about 21% and the barometric pressure averages 760 mmHg.
• As altitude increases, the concentration remains the same but the number of oxygen molecules per breath is reduced.
• At real altitude, the barometric pressure of the atmosphere is significantly less than that of sea-level environments.
• The result is that oxygen molecules in the air are further apart, reducing the oxygen content of each breath incrementally as one goes up in altitude.
• The reduction of oxygen availability in the air thus reduces the oxygen.
• The amount of oxygen in the atmosphere has fluctuated over the last 600 million years, reaching a peak of about 30% around 280 million years ago, significantly higher than today's 21%.
• Two main processes govern changes in the atmosphere: Plants use carbon dioxide from the atmosphere, releasing oxygen.