Animals in danger
Facts
Endangered animals
Video
Video2
Science
Sound
Changing sound
Sources of sound facts
loudness facts
Pitch facts
Sound-activity2
Sound-activity3
Sound-activity4
Sound quiz
Ear cross section game
Light
Light-activity1
Light-activity2
Light-activity3
Lunar Eclipse
Machines
Unit 3- We need energy
Saving energy
Facts
More about energy
Interactive activities
Unit 1- Our world
Biomes
Biomes for kids
Habitats
Human-animals Habitats
Science
Unit 1- Matter and Energy
- Properties of materials
1-Transparency
Transparent- Light can pass through it. Ej- Glass is transparent.
Opaque- Light can't pass through it. Ej- Metal is opaque.
Translucent- Some light can pass through it. We can't see objects clearly through it.
2- Permeability
Permeable- Water can pass through it. Ej- Fabric is permeable.
Waterproof- Water can't pass through it. Ej-Plastic is waterproof.
3-Fragility
Strong- Difficult to break. Ej- Plastic is strong.
Fragile- Easy to break. Ej- Glass is fragile.
4- Flexibility
Rigid- Difficult to bend. Ej- Wood is rigid.
Flexible- Easy to bend. Ej- Paper is flexible.
5- Hardness
Hard- Difficult to scratch or cut. Ej- Glass is hard.
Soft- Easy to scratch or cut. Ej- Wood is soft.
6- Brightness
Shiny- It reflects much light.Ej- Gold is shiny.
Dull- It reflects little light. Ej- The wall is dull.
7- Conductivity
Conductor- Heat or electricity can flow easily. Ej- Metals are good thermal. conductors.
Insulator- Heat or electricity can't flow easily.Ej- Plastic is insulator.
 |
| This ring is made of gold and a diamond. Gold is a metal; shiny, hard and waterproof. A diamond is a mineral; shiny, translucent, hard but fragile. |
- Properties of substances
8- Solubility
Soluble- It dissolves in a liquid. Ej- Salt is soluble in water.
