Which of the following readings is used to determine the availability of minerals?
a.
radioactivity
b.
magnetism
c.
gravity
d.
all of the above

The option that represents thy type of reading which is used to determine the availability of minerals is D. all of the above. Depending on the situation, as well as the type of a mineral, scientists will use radioactivity, magnetism, or gravity in order to determine how much of a mineral there is in a certain area. Some of these techniques are good for one type of a mineral, and some for another, but these scientists use all three types of readings in order to determine what they need.

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.

Average growth population growth