Atmosphere and Hydrosphere Review

Atmosphere Composition

100

Do the particles in the atmosphere form a heterogeneous or homogeneous mixture? What does this mean?

They form a homogeneous mixture, meaning the individual components can't be seen.

200

What is the most abundant gas in the atmosphere?

Nitrogen

300

What is the importance of carbon dioxide in the atmosphere?

Autotrophs need it for photosynthesis, it is released by plants and animals through respiration.