Globes are three-dimensional models of the Earth that provide a more accurate representation of the planet's surface than maps. On globes, countries, oceans, and continents are shown in their correct size.

Reasons why countries, oceans and continents are shown in correct size on globes:

1. Scale: Globes are created using a scale that accurately represents the size and shape of the Earth's surface. This means that countries, oceans, and continents are shown in their correct proportions.

2. Three-dimensional representation: Unlike maps, globes provide a three-dimensional representation of the Earth's surface. This allows for a more accurate depiction of the size and shape of countries, oceans, and continents.

3. No distortion: Maps, particularly those that represent the entire world, often suffer from distortion. This can cause countries and continents to appear larger or smaller than they really are. However, globes have no such distortion because they are a true representation of the Earth's surface.

4. Accurate measurements: Because globes are created using a scale and a three-dimensional representation, they allow for accurate measurements of distance and size. This makes them valuable tools for navigation and scientific research.

In conclusion, globes are an accurate representation of the Earth's surface, showing countries, oceans, and continents in their correct size. They are created using a scale, provide a three-dimensional representation, have no distortion, and allow for accurate measurements.