His story, after a caesura, started again.

The living standard of the middle class is positioned between the poor and the wealthy.

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

I am an Earthling.

We are searching for extraterrestrial life.

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

The economic situation in the euro zone has a significant impact on the global economy.

The thermosphere is a part of the Earth's atmosphere, located above the stratosphere and the mesosphere.

That country is trying to expand their sphere of influence.

The stratosphere is a part of the Earth's atmosphere, located above the troposphere.