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Observation is broken up into three parts. The first is the date. Then you have the activity and last you have a brief description of what is being observed.
Drinking water shortages? Water across the world isn't purified which without purification doesn't quench thirst.
Density can be useful in identifying substances. It is also a convenient property because it provides a link (or conversion factor) between the mass and the volume of a substance. Mass and volume are extensive (or extrinsic) properties of matter - they depend on amount.
