The earth is round, due to gravity, so there are no flat bits at the top and bottom.
clouds.
...is called a skiff.
fluitschips
A flat representation of the Earth is called a map projection. The surface of the Earth cannot be accurately represented on a flat surface, so there are various way to approximate it. The different way are called projections.
It is still called the Earth.
A projection
Firstly, the Earth is round, so the ocean cannot be flat. Secondly, the Sun and the Moon's gravity are pulling on the ocean surface, causing it to bulge. Thirdly, there are waves and currents in the ocean.
The stem.
These are cumulus clouds.
A small flat copy of the Earth is called a map. It is a representation of the Earth's surface, showing geographical features and locations in a scaled-down form.
Sampans are used as houseboats in China.
Yes - those that are conventionally called the "top" and "bottom".