Answer: The Answer is A
Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as synchronous rotation, or tidal locking. The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases.
From rocks and lava and earthquakes
All of them are a source of getting energy but solar and wind energy are a more beneficial way of producing the energy we need.
Answer:
Bubbles will be formed when two solutions will be combined.
Explanation:
When the solution containing 
and 
as a solute will be combined, the reaction will be as follows,
As a result of combination of the two solutions bubbles will be formed which will depict the evolution of carbon dioxide gas.
