​Humid air is ____ than dry air because molecules of water vapor ____ than molecules of nitrogen and oxygen at the same temperature.

Which sentence has correct idiomatic use of prepositions?

There are three types of plate convergences: continent–continent, ocean–continent, and ocean–ocean convergent plate boundaries.

Which of the following statements about clauses and phrases is most accurate?

The long-term statistical sum of weather in a geographic region is called ____.

​Who was the first person to compile a picture of the large-scale wind and current systems?

​Sound can travel for much greater distances through water than light waves can before being absorbed because ____.

The process of changing fatty acids to several molecules of acetyl CoA is called:

Density is a measure of relative heaviness and is defined as mass per unit volume.

The Challenger expedition used multibeam echo sounders to contour the seafloor.