Is glow worm light natural or artificial?

Are candles light natural or artificial?

Are stars light natural or artificial?

Is kerosene lamp light natural or artificial?

Is comet light natural or artificial?

Is flashlight light natural or artificial?

Is the Sun light natural or artificial?

Is electric bulb light natural or artificial?

Is firecracker light natural or artificial?

Does the stove produce heat?

Does the lampshade produce heat?

Do clothes produce heat?

Does fire produce heat?

Is whispering soft noise or loud noise?

Is drilling soft noise or loud noise?

Is ringing the bell soft noise or loud noise?

Is playing the drums soft noise or loud noise?

A computer produces heat and light

Volume is the highness or lowness of sound

The Sun is the main source of heat

A luminous object gives off its own light

What does a vibrating object produce?

Which of the following produces the loudest sound?

A _______ is a highland. It is higher than the land that surrounds it.

A _____ is also a highland but it is smaller than a mountain.

A ______ is a stretch of lowland between hills, mountains or highlands.

A ____ is a body of salty water that is smaller than an ocean.

A _____ is a large body of fresh water flowing continuously across the land to sea

Springs may be hot or cold

Fishermen can catch fish in the lake

Water is important for your personal use.

Fishes are only found in oceans and seas.

Oil is spilled in the sea.

People burn their trash

Farmers use chemicals like fertilizers to produce good crops

Rubber tires are burned

Tricycles give off smoke