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Purple loosestrife, introduced into a wetland ecosystem, is an example of this type of population
change ...
Because our planet has a lot of water on its surface and is rich in vegetation, astronauts from space have described it as the ...
Of all the water on the Earth, the only water that is fit for humans to drink is called ...
Many substances are dissolved in freshwater and saltwater. This is because water is a solvent that is
widely used to dissolve substances. (This will be covered in more detail in MIX AND FLOW OF MATTER). ‘Water’ is known as the ...
Most of the substances that are dissolved in water are salts. Not just sodium chloride, but many
different kinds of salts. The total amount of all salts dissolved in the water is referred to as its ...
Hard water is water that contains high concentrations of dissolved ...
Water quality is a vital issue because many of the organisms, which can harm humans, are too small to see with the naked eye. Another organism, which can give humans intestinal problems, is Giardia, which is a microscopic ...
When testing samples of water for the presence of living organisms, the students put 125ml of their
samples into separate flasks and added 5 drops of bromothymol blue. They labeled it, put a stopper
in it and placed it in a warm dark place for 24 hours. What were they looking for, to indicate that living organisms were present in the water?
Waves are movements on the surface of the water. The kinds of waves that boats make as they
travel across the surface of the water are called ...
Sometimes, in order to understand a concept that is important, models are used to help us visualize it. The movement of waves shown in the diagram can be modeled by using ...
Extremely large waves that can grow to be as high as a 15-storey building are called tsunamis.
These waves spread out over a very long distance from their source, which is ...
Stream characteristics help scientists understand where different organisms might live in a river and how they might be affected by human activities. These same stream characteristics are used when dams and bridges are designed and built by ...
A river’s sediment load is the amount of ...
Major North American watersheds are determined by the Continental Divide. This is where you find the highest land and is located in
the ...
Geological features on the ocean floor are a result of the continental plates moving. Where the plates are moving away from each other you will find ...
Continental glaciers, or icecaps cover large areas of land, forming the coldest regions on the Earth.
Glaciers can also form high up in mountain ranges, where snow and ice build up over long periods of time. These glaciers are known as ...
Glaciers gouge huge areas of the land and then reshape
the land by the materials they collect and deposit. Some
of the features include rounded hills. These are called ...
Large bodies of water affect the climate of a particular area. The main effect that they have is to ...
The reason that the eastern side of the Rockies (Lethbridge and Calgary) receives a Chinook (warm dry wind) is because it is located in a ...
Currents coming from the Arctic region like the Labrador current carry cold air, and that is partly what can account for Labrador’s cold climate. Scotland gets warm air from the North Atlantic Current because it comes from ...
Diversity occurs within many different ecosystems around the world. The ecosystem(s) that is/are the most diverse is the ...
The continental shelf is a shelf of land that extends out from the edge of a continent below the ocean’s surface. The water in this zone of the ocean is ...
Another important zone in the ocean ecosystem is the one that contains brackish water (a mixture of saltwater and freshwater). It is called the ...
These types of population changes can occur naturally but do not happen every year ...
Prairie lakes with high concentrations of carbonates and bicarbonates have white coatings on the rocks near the shoreline. These minerals have been dissolved out of the soil and have made the lakes ...
Often when too many chemicals are added to an environment, pollution occurs. This is evident
when fertilizer runoff from farmer’s fields increases the growth of green slime in a body of water nearby. This green slime is called ...
A population is related to a species in the following way ...
Water use by humans on the Earth can be direct or indirect. When humans use water directly it is called...
Dissolved salts, in the soil, can be deposited on the surface causing a serious side effect for this agricultural use of water ...
Approximately 5% of human use of water is domestic. Clean water is purified and piped into homes in ...
There are many advantages and disadvantages to the construction of Dams. Canada has most of its
major rivers dammed. The following is an advantage of a dam ...
A small micro-organism parasite, that lives in local water supplies, called Giardia, causes ‘giardiasis’,
makes people sick. The illness is also referred to as ...
Science and technology are two ways to solve many of the environmental problems society faces, but another more important way to solve problems is to get ...
To maintain high standards in terms of water quality, cities and towns hire these people to measure chemicals and organisms in the water ...
