The correct answer would be coal.
Answer:
I think its Global Climate / Global Warming
Explanation:
This is because glaciers and ice sheets worldwide are melting and adding water to the ocean. And the volume of the ocean is expanding as the water warms.
B. Their remote location has kept out invaders.
The greenhouse effect is the rise in temperature that the Earth experiences because certain gases in the atmosphere (water vapor, carbon dioxide, nitrous oxide, and methane, for example) trap energy from the sun. Normal warming is mostly caused by natural gases.