Science 4

The materials that cannot absorb water.

• Absorbent

• t-shirt

• Non absorbent

It is how well something floats.

• Density

• Volume

• Buoyancy

It refers to demolition and construction debris and trees.

• Large Waste

• Rubbish

• Decaying materials

It refers to slag heaps and coal refuse piles.

• Garbage

• Mining waste

• Humus

It refers to materials that do not decompose naturally and easily in the environment.

• Biodegradable Wastes

• Reuse wastes

• Non-biodegradable Wastes

These are new products made out of old materials.

• Recycle

• Reduce

• Repair

These are the ones that are observable.

• Temperature

• Chemical Change

• Physical Change

Change the states of matter by forcing out the moisture in materials.

• Condensation

• Sublimation

• Pressure

Takes place when oxygen and moisture in the air combine with metal.

• Rusting

• Cooling

• Burning

The process of using certain organic materials as manure for growing plants.

• Fertilizer

• Composition

• Manure