(a)   lights are produced from the materials that are made by human.

(a)   lights are also called MAN-MADE source of light.

The natural light in day time.

(a)  

Made up of hot glowing gases that gives off HEAT and LIGHT. It is a medium-sized star that produces its own light.

(a)  

Example of living things that can produce natural lights.

(a)  

Common source of artificial light at home.

(a)  

Scientists use lights to study the celestial objects using (a)  

Scientists use lights to study microorganisms using (a)  

The greatest source of light energy and heat energy on earth.

(a)  

(a)   comes from the HOT GLOWING and MOVING particles that make up the sun.

HEAT ENERGY from the sun is also called ___ ___

(a)  

The HEAT that comes from within the earth is called ___ ___

(a)  

Hot rocks or (a)   beneath earth that comes out to surface through erupting volcanoes.

(a)   are those materials that can BURN and RELEASE HEAT ENERGY.

(a)   can also provide heat energy to some materials at home, this is a form of energy that can be converted to heat energy in materials we need at home, such as water heater, microwave oven, toaster electric bulb, electric stove, flat iron, etc.

What produces heat energy when 2 surfaces rub against each other

(a)  

The heat of the sun changes water from the bodies of water on Earth to gas or vapor through EVAPORATION. What is this cycle?

(a)  

The (a)   of the of the air changes according to the amount of heat that enters the Earth's atmosphere.

(a)   is produced by the vibrations or back and forth movement of the tiny particles in an object.

The different objects that produce vibrations are sources of (a)  

The different objects that produce (a)   are sources of sound

Sounds from (a)   sources include those produced in nature like thunder, strong blowing of winds, flowing of water in waterfalls and rivers, erupting volcanoes, landslides, rain, ocean waves.

Sounds may come from (a)   or ARTIFICIAL sources, like musical instruments, TV, radio etc.

Sound is used by animals to find food through (a)  

The sound that is beyond human hearing is (a)   . it is used in medicine to scan internal organs

____ ____ is used in technology to clean jewelries and remove ice from metals, produce lights, detect cracks in metals and detect motion in some objects.

(a)  

Sound is used to measure the depth of the ocean, and detect sunken vessels & treasures under water through (a)  

(a)   is a handy source of electricity. You can take it with you wherever you go.

Battery is a handy source of electricity. You can take it with you wherever you go. Battery is also called (a)  

The most common and widely used sources of electricity are ____ ____.

(a)  

____ ____ used by power plants are energy from the

- SUN

- WIND

- WATER

- HEAT from underground

(a)  

The _____ _____ of electricity comes from power plants that use FOSSIL FUELS like:

- COAL

- PETROLEUM

- NATURAL GAS

(a)  

_____ ____ ____ use FALLING WATER from waterfalls or man-made dams to turn the blades of machines that produce electricity. Too much water or too little water in the dams can affect the flow of electricity to our homes.

(a)  

In some places, people use SOLAR ENERGY to produce electricity by means of _____ _____

(a)  

In the Philippines, this is the most common source of electricity. Using falling water from waterfalls or man-made dams to turn blades of machines that produce electricity.

(a)  

Electricity is used to run machines and appliances that are used in the (a)   and PRESERVATION of food.

- refrigerators

- freezers

- water dispensers

- microwave ovens

- electric stoves

Electricity is used to run machines and appliances that are used in the PREPARATION and (a)   of food.

- refrigerators

- freezers

- water dispensers

- microwave ovens

- electric stoves