It is the growth by the gradual accumulation of layers.

It is one galaxy among many. It is the galaxy that contains our Solar System.

Name of Dwarf planets

It is called the red planet. It is about half the size of Earth.

Form of energy that travels through space by electromagnetic waves.

It is the pulling force between objects.

Objects that are used to do work.

Be careful with your eyes. – Put your hair back if it is too long. – Wear closed-toe shoes and apron. – Do not play in the lab science. – Use safety goggles. – Follow instructions. – Label everything.

Planets with solid, rocky surfaces composed of minerals. They usually possess a central metallic core. They are smaller in size and have less mass. Examples are Mercury, Venus, Earth, and Mars.

When one object moves around another object. Earth takes one year to complete it. It causes seasons.

It is the closest planet to the Sun. It is the smallest planet in our Solar System.

The spinning motion of an object around its axis. Rotation takes 24 hours and is responsible for the day and night.

It is a circular depression on the surface of a planet, moon, or other celestial body, typically caused by the impact of a meteoroid, asteroid, or comet.