What will a warm air mass do wen it moves into a cold air mass ?

a. go under the cold air mass

b. hit the cold hair mass and then retreat

c. neither move under or over the cold air mass

d. go over the cold air mass

Idk i think the answer choice is number 1

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.