I often go to the sea on weekends.

The process of terraforming is part of transforming other planets into a habitable environment for humans.

Earth science is an important field of study for unraveling the mysteries of nature.

I am an Earthling.

We are searching for extraterrestrial life.

He was my student, but now he has become so proficient that it can be said 'the student has surpassed his teacher.'

Koriko is my best friend.

On a hot day, it's the best to buy ice cream at the ice shop.

I took out the ice cup from the refrigerator.

When the ice cap melts, the sea level rises.