I think its C but I could be wrong, but I think it's c because water vapor evaporates in the atmosphere due to the heat off the sun and it turns to water again and then the water heats up and turns into vapor.
This is a true statement because such things are found on data maps. Usually, lakes, oceans, rivers, or any other type of water, are indicated with shades of blue to show the depth. The greater the depth the darker the blue will be.
If I remember A biography should be the correct answer
Ancient Rome received all of its water through a network of aqueducts, which used gravity to make the water flow toward the city.