He cannot challenge new things because he fears failure.

He couldn't express his opinion because of his fear of his boss.

This tree has fossilized over thousands of years.

I like finding fossils.

Her smile was shining brightly.

His name is Sansan.

The use of fossil fuels is causing global warming.

This subfossil shows the life of creatures from thousands of years ago.

He decided to participate in the meeting.

In this chemical reaction, iron reacts with oxygen and oxidizes.