Riku is my best friend.

Rikuo is my best friend.

This math problem requires finding out what the base of the logarithm is.

What is at the bottom of this lake?

The American continent is where diverse cultures and nature coexist.

He is thinking about wanting to travel to the African continent.

In geology, the continental slope refers to the point where the seabed becomes steeply deep.

The Australian continent is the smallest continent on Earth.

The Asian Continent is the largest continent on Earth.

The president granted him a pardon.