Chris Arvetis

Explains, in simple language, how the rotation of the earth causes day and night.

Explains in simple terms how a plant makes its own food and maintains a green color through photosynthesis.

Explains in simple terms what is a dinosaur and a fossil.

A description in simple terms of what a cloud is and how one is made.

Explains in simple terms why an airplane can fly.

Depicts how the hot inner core of the earth works its way out through the surface in volcanoes.

Explains in simple terms why leaves change their colors in the fall.

Explains in simple terms what a desert is.

Explains in simple terms what is a star?

Explains, in simple language, why birds migrate south in the winter.