Using a refillable beverage container (returnable bottles) would be an example of materials.

Using a refillable beverage container (returnable bottles) would be an example of reusing materials.
There are three R's used for waste disposal: recycle, reuse and reduce. Reusing is a great technique used to eliminating waste materials and to protect the environment. There are many items or materials in our homes that we can reuse again and again.

It should be cryosphere and hydrosphere

From our previous experiment, we examined how many drops a penny can hold - and place drops of salt water on the penny after recording 5 trials each, take the average of each solution.