The is the imaginary line that passes through the Earth's center and the North and South poles.

The Earth's rotation causes .

It takes hours for Earth to rotate one time.

The movement of the Earth around the Sun is a .

It takes days for the Earth to travel once around the Sun.

The path that Earth follows is call a(n) .

The equator is always receiving sunlight.

The north and south poles are always receiving sunlight.

The definition of gravity is the .

If the mass of an object increases, the force between them .

If the distance between two objects increases, the force between them .

weight=mass*

The acceleration of gravity on Earth is m/s^2.

The unit for weight is .

The unit for mass is .

The mass of an object was 112 kg. Its weight on the Earth is Newtons.

An object's mass on the Moon was 419 kg. Its mass on the Earth is kg.

is the tenancy of an object to resist a change in motion.

states that an object in motion will stay in motion and an object at rest will stay at rest unless acted upon by an outside force.

A(n) is the central darker part of a shadow.

A(n) is the part of a shadow surrounding the darkest part.

A solar eclipse occurs in the phase.

A lunar eclipse occurs in the phase.

A person in the Moon's umbra would see a solar eclipse.

A person in the Moon's penumbra would see a solar eclipse.

The changing tides are caused by the .

Around the world, high tides occur times a day.

Approximately days after a Spring Tide, a Neap Tide occurs.