Question

The _____ law of thermodynamics states that energy can't be created or destroyed. Two natural sources of energy on Earth are the _____.

First, Sun and core of Earth
Second, Sun and rock
Second, Sun and biosphere
Third, core of Earth and hydrosphere

Answer 1

the answer is The First law of thermodynamics states that energy can't be created or destroyed. Two natural sources of energy on Earth are the Sun and core of Earth.

Answer 2

First, Sun and core of the Earth. The rocks have some heat because of the inner heat of the planet, and the energy created by other sources are far smaller than our molten core generates.

On the other side, if you're speaking about clean sources of energy we can take advantage from, I'd go for sun and biosphere, considering the solar and wind energy they most advanced and widespread sources we have.