There is a strong correlation between the number of firefighters that show up at a fire andthe amount of damage produced by the fire. The size of the fire influences both thenumber of firefighters and the amount of damage. This illustrates that the relationship between the number of firefighters and the amount of damage is:a. caused by a third factorb. causalc. not correlationald. a real relationshipe. cannot tell from the information given

The correct statement is that the relationship between the number of firefighters and the damage caused by fire is caused by a third person. So, the correct option is A.

The third factor refers to a factor which is not directly related to the event but takes part in the events due to the relational factors and parties to the event are present.

Hence, the correct option is A that the damage caused by fire is the third factor in the relationship between the fire and the firefighters.

To  know more about third factor relationships, click the link below.

link

A) caused by a third factor

Explanation:

"third-factor" refers to a factor that has a connection to two other unconnected variables ,

In the example above:

Variable 1 = Number of Fire Figther

Variable 2 : Amount of damage.

Variable 3: Fire

When variable 3 does not exist, Variable 1 and variable 2 do not have any connection with one another, since firefighters are not the one that doing the damage.

But, the relationship between variable 1 and variable 2 will arise when variable 3 (Fire) come into the picture. As variable 3 increase, both of variable 1 and 2 will also increase along with it/

c is the answer for this

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)