When geophysicists measure the geothermal gradient in areas on the ridges where there is no activity hydrothermally, the gradient is far below than what is predicted theoretically, but when measured near hydrothermal vents it is more than what is predicted. This is because most of the heat is being carried through convection by hydrothermal systems so that the average gradient when measured far from the circulation would be depressed or lower.
B is the correct answer according to my calculations.
Answer:

Explanation:
Given




Required
Determine the linear equation for P in terms of h
First, we calculate the slope/rate (m);
The following formula is used:

Substitute values for P's and h's



Multiply by 1000/1000


The equation is then calculated using:

Substitute values for m, h1 and P1



Make P the subject

<em>The above is the required linear equation</em>
Answer:
<h3>
The coefficient of kinetic friction between the puck and the ice is
0.12</h3>
Explanation:
Given :
Initial speed 
Displacement
m
From the kinematics equation,

Where
final velocity, in our example it is zero (
),
acceleration.


From the formula of friction,

Minus sign represent friction is oppose the motion
Where
( normal reaction force )
( ∵
)
So coefficient of friction,


Therefore, the coefficient of kinetic friction between the puck and the ice is
0.12 .