"Land masses of the Earth" refers to the continents and islands that make up the Earth's surface. It's basically everything on Earth that is not covered by water.

Here's a breakdown:

* Continents: The seven large landmasses on Earth: Asia, Africa, North America, South America, Antarctica, Europe, and Australia.

* Islands: Smaller landmasses surrounded by water. Some islands are part of continents (e.g., Greenland is part of North America), while others are independent landmasses.

So, when someone says "land masses of the Earth," they're referring to all the land areas on our planet, big or small.