WorksheetsOvergrazing, Mining, and Beaver Dams
Total questions: 10
Worksheet time: 5mins
Which of the following is a harmful effect of beaver dams?
Water does not reach plants or animals downstream who depend on it for survival.
Beavers get stuck behind the dam.
There are no harmful effects.
Beaver dams create lakes.
Which of the following is a beneficial effect of beaver dams?
They create droughts.
Dams create places for beavers to play with their friends.
Dams create pond environments in which new plants and animals can survive
Dams are great for keeping floods from happening.
What is a dam?
It is a structure that blocks water created by beavers.
It is a structure that blocks fire created by firemen.
It is a structure that blocks animals from getting into rivers by beavers.
What is overgrazing?
When beavers create a structure that keeps water from flowing through.
When humans put toxic chemicals in the water.
When herd animals (like cows) over graze or eat too much from the land.
When people throw seeds all over the land.
What is a harmful effect of overgrazing?
Animals may pollute streams or lakes with their droppings
Land with less or no grass can be easily eroded by wind and water
Animals may become overweight.
A and B.
A beneficial effect of overgrazing is that herd animals fertilize the land with their droppings which lead to new plant growth.
True
False
What is mining?
Humans dig mines in the ground or inside mountains.
Humans using their mind to think with a large group of people.
When herd animals eat too much in one place.
When beavers create a structure that stops water from coming through.
Which of the following are a harmful effect of mining?
Sinkholes can form, swallowing large areas of land.
Trees are logged to create areas for dumping debris from the mine.
Water can be polluted by chemical runoff from mines.
All of the above.
Which of the following are NOT a beneficial effect of mining?
Extract metals and minerals to build things.
Make jewelry.
Make medicines and materials, etc…
Water can be polluted from runoff from mines.
Habitats changing due to overgrazing, mining, and beaver dams are an example of
Changes due to natural causes
Changes due to the actions of organisms.
