Answer:
1. No, since submerged means "descending below the surface of water". Sub, the prefix meaning "under" and merge-to join help define this word. Floating is not the definition of underwater, thus submerged does not mean floating.
2. (may not be correct, but. . .) Yes; canals are artificial waterways in which boats may be transported between bodies of water. They are specifically meant for this kind of transportation.
3. No, since any human needs oxygen in an atmosphere. Just as Earth's atmosphere supplies and keeps the gases we breathe, any planet must require an atmosphere and similar gases to be habitable for humans.
4. No, because forlorn means "feeling pity for oneself". Clover is probably hungry and feels sorry that there is no food. He is not excited about his empty bowl.
5. False; taking immense, or copious amounts, of pleasure in one subject does not necessarily mean that you do not at all enjoy the other. This statement does not show you do not enjoy chess as well as you enjoy soccer immensely.
6. Yes, since mosaic is a piece of art consisting of colorful bits of stone. Without color, a mosaic is an art, but not truly itself.