In which layers is the air very thin as well as very warm?

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health?

What kind of fault is the san andreas fault