How many continents are there on Earth?
There are seven continents on Earth. These are: Asia, Africa, North America, South America, Antarctica, Europe, and Australia.
Complete the following task based on the instruction and optional input provided.### Instruction:
How many continents are there on Earth?

### Output:
There are seven continents on Earth. These are: Asia, Africa, North America, South America, Antarctica, Europe, and Australia.