Question

Sunlight hitting Earth's surface - 3.190,000 kcal

What unit is being used to measure energy?
a. What is the source of all energy in the pyramid in Model 1?
The source of energy being used is kinetic energy
b. How much energy does this source provide to a square meter of the Earth per year?

Answer 1

The unit being used to measure energy in this case is kilocalorie (kcal), which can be converted to joules. The source of all energy in the pyramid in Model 1 is the Sun.

Step-by-step explanation:

The unit being used to measure energy in this case is kilocalorie (kcal). One kilocalorie is equal to 4184 joules. Therefore, the sunlight hitting Earth's surface of 3.190,000 kcal can be converted to about 1.3389 × 10^9 joules.

The source of all energy in the pyramid in Model 1 is the Sun. The Sun provides kinetic energy to a square meter of the Earth per year through the sunlight that reaches the surface.