Question

Earth is sometimes called the

1. "water planet," because almost 75% of its surface is covered with water.
2. "oxygen planet," because oxygen is necessary for life.
3. "carbon planet," because carbon is the central element in organic compounds.

4. all of the above.

Answer 1

Earth is known as the "water planet" due to the vast coverage of water on its surface, which is essential for sustaining life, leading to its nickname "the blue marble". The correct option is 1.

Step-by-step explanation:

Earth is often referred to by a variety of names that reflect its unique characteristics, crucial for the existence of life.

One of the most common monikers is the "water planet", a name it earns because almost 75% of Earth's surface is covered with water, including oceans, rivers, lakes, and ice.

This abundance of water, which is essential for all known forms of life, gives Earth its beautiful blue appearance from space, leading to the nickname "the blue marble".

Water's vital roles range from being a solvent in which chemical reactions occur to regulating the Earth's temperature.

Thus, while Earth's atmosphere and the presence of carbon are indeed important for life, the abundance of surface water makes the designation "water planet" particularly descriptive.The correct option is 1.