The roots will grow upwards due to gravity.

The roots will grow downwards due to gravity.

The roots will grow towards the light.

The roots will grow towards the paper towel.

It is easier to run downhill than to run uphill.

Trees grow to be many different heights.

Big, heavy planes can fly but small animals like mice and hamsters cannot.

On a clear night you can see millions of stars in the sky.

It is easier to run downhill than to run uphill.

Trees grow to be many different heights.

Big, heavy planes can fly but small animals like mice and hamsters cannot.

On a clear night you can see millions of stars in the sky.

The roots will grow upwards due to gravity.

The roots will grow downwards due to gravity.

The roots will grow towards the light.

The roots will grow towards the paper towel.

The roots will twist around.

The roots will grow towards the sky.

The roots will grow towards the ground.

The roots will not grow in a bag.

The roots will twist around.

The roots will grow towards the sky.

The roots will grow towards the ground.

The roots will not grow in a bag.

A basketball player bounces the ball off the ground and it returns to her hand.

An airplane lands gracefully when being piloted by an expert fighter pilot.

A maple tree’s discarded leaves lay beneath it in late autumn.

The planets remain in the same orbit around the sun for billions of years.

A basketball player bounces the ball off the ground and it returns to her hand.

An airplane lands gracefully when being piloted by an expert fighter pilot.

A maple tree’s discarded leaves lay beneath it in late autumn.

The planets remain in the same orbit around the sun for billions of years.

Gravity pulls objects downward, as you can see from watching rain fall down from the sky.

Gravity does not work in water, or else boats and rafts would not float.

Gravity only works on some animals, like dogs and cats, but not on others, like birds and insects.

Gravity can pull objects upward or downward depending on the kind of object.

Gravity pulls objects downward, as you can see from watching rain fall down from the sky.

Gravity does not work in water, or else boats and rafts would not float.

Gravity only works on some animals, like dogs and cats, but not on others, like birds and insects.

Gravity can pull objects upward or downward depending on the kind of object.