Question

describing the composition of earth’s atmosphere
read the question, and then use the drop - down menus to complete the paragraph.
what is earth’s atmosphere made of?
the most abundant gas in earth’s atmosphere is ▼, followed by oxygen ▼, which is needed to
burn wood and fuel. the third - most abundant gas is ▼. the amount of ▼ in the atmosphere
is very small, making up just 0.033% of the atmosphere, but it is very important because plants use it to make simple
sugars. another important gas is water vapor, which condenses around ▼ in the atmosphere to form
clouds and then rain.

Explanation:

1. Nitrogen makes up about 78% of Earth's atmosphere, so it is the most abundant gas.
2. Argon is the third-most abundant gas, accounting for roughly 0.93% of the atmosphere.
3. Carbon dioxide (CO₂) is present at ~0.033% (historical value referenced here) and is used by plants in photosynthesis to make sugars.
4. Water vapor condenses around tiny particles like dust or aerosols in the atmosphere to form cloud droplets, which lead to rain.

Answer:

The most abundant gas in Earth's atmosphere is nitrogen, followed by oxygen, which is needed to burn wood and fuel. The third-most abundant gas is argon. The amount of carbon dioxide in the atmosphere is very small, making up just 0.033% of the atmosphere, but it is very important because plants use it to make simple sugars. Another important gas is water vapor, which condenses around dust particles/aerosols in the atmosphere to form clouds and then rain.