Scientists have organized Earth’s atmosphere into layers according to atmospheric pressure.

altitude.

oxygen density.

temperature.

Why did jefferson make the louisiana purchase?

What enabled the drastic increase in us troop development to vietnam between 1964 and 1965?

7. how did the early egyptians use the flooding of the nile river to their advantage? they diverted the water to flood their enemy's lands and destroy their crops. they created an easier way to travel to the mediterranean sea and the indian ocean. they established a new water-based athletic event for the ancient olympics in greece. they devised an innovative irrigation system, which created a surplus of food.