Grade 4 - Materials

It is the amount of matter that an object has.

• Density

• Buoyancy

It is the amount of matter that an object has.

• Buoyant Force

• Food Spoilage

It is one form of decay.

• Buoyant Force

• Food Spoilage

It is a property of a material that lets it absorb water and other liquids.

• Porosity

• Non-Porous

1. They help break down dead plants and animals, returning substances and nutrients to the soil for plants to reuse in the form of natural fertilizers.

• Materials

• Decomposer

1. What do insects like flies, cockroaches, rats, and mosquitoes carries?

• Decaying Garbage

• Disease Causing-Germs

1. The waste that decompose naturally in the environment.

• Biodegradable

• Non-Biodegradable

1. It simply means to lessen the amount of trash.

• Reduce

• Reuse

• Recycle

1. These are considered useful when it serves a purpose.

• Materials

• Decomposer

1. Materials such as metal and plastic cannot absorb water.

• Porosity

• Non-Porous