Earth Resources and Water Flashcards
What is drinkable water called?
Potable water
What does potable not mean?
Chemically pure
What do we need to do to water to make it potable?
We need to drastically reduce the number of microbes found in it. We also need to reduce the concentrations of dissolved minerals and salts found in the water.
What is chemically pure water made up of?
Made of just HtwoO molecules.
Where can we obtain potable water from?
- Fresh water
- Seawater
- Waste water
Which source of potable water is the easiest to treat?
Fresh water
What is the most expensive source of water to treat?
Seawater
What two steps are taken to treat rain water?
- Filtration: particles of solid are filtered out by passing the water through a wire mesh.
- Sterilisation: harmful microbes are killed by bubbling chlorine gas through the water.
What is a non-renewable resource?
Non-renewable resources are regenerated at a much slower rate than we use them.
What are some examples of non- renewable resources?
- Fossil fuels
- Nuclear fuels
- Metal ores
What is a renewable resource?
Renewable resources don’t run out as they are regenerated quicker than they’re used.
What are some examples of renewable resources?
- Timber
- Fresh water
- Food
What has a rapid increase in population forced humans to do?
Forced us to find ways to supplement the Earth’s natural resources.
What is the main example of a supplement to natural resources?
AGRICULTURE
Natural food products (e.g. beef, maize, wheat etc.) are now available in much larger quantities because of the organisation of agriculture.
What product reduces our reliance on natural products?
Synthetic products