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WorksheetsScience 6 Unit 3 Review
Total questions: 20
Worksheet time: 40mins
Human activities are adding to climate change by...
Increasing the amount of fun we have everyday.
Adding more pollution to the oceans and seas.
Adding to the amount of greenhouse gases in our atmosphere.
In the past Earth has had periods (many years at a time) of warming and cooling.
True
False
Greenhouse gases in small amounts are good for the Earth because they...
give our planet a nice lemon fresh scent.
keep our Earth warm, but not too warm.
keep our Earth super cold like a freezer.
The greenhouse effect kept our Earth's temperature just right in the past because...
people were burning LESS fossil fuels.
people were taking LESS baths and showers.
people were burning MORE fossil fuels.
Choose the BEST reason scientists have measured a RISE/INCREASE in the amount of greenhouse gases in our atmosphere.
A human-shaped rock in the ocean is burping carbon dioxide.
Cows are releasing methane in their burps and farts.
Humans are burning more fossil fuels now than they did in the past.
Select the evidence below that supports climate change is indeed happening to the Earth.
The amount of precipitation is decreasing in some places.
The average temperature on Earth is increasing.
Ice in the North and South Pole is melting.
All of these are correct.
If our atmosphere has a LARGE amount of greenhouse gases the greenhouse effect becomes STRONGER because...
greenhouse gases keep MOST of our Sun's heat IN our atmosphere.
greenhouse gases allows the SAME amount of the Sun's heat OUT as comes IN our atmosphere.
greenhouse gases let out MOST of the Sun's heat to outer space.
Select the example below that is a POSITIVE (good) effect humans have had on our environment.
Recycling metal cans, plastic bottles, and paper.
Littering your food wrappers.
Cutting dow trees for paper.
Select the example below that is a NEGATIVE (bad) effect humans have had on our environment.
Using solar panels to generate electricity.
Replanting trees where they have been cut down.
Packaging food in plastic creating more waste.
Our water in Las Vegas come from the...
Nile River
Rio Grande
Colorado River
River of Student's Tears
How was Lake Mead created?
Hoover Dam was built and the Colorado River flooded behind it.
Your teacher dumped out their bucket of student tears.
The Rio Grande flooded behind the Hoover Dam after the dam was built.
The Colorado River is fueled (filled) by what water source?
Snowmelt from the Rocky Mountains.
Glacier melting in Antarctica.
Gasoline from the Shell gas station.
The water level of Lake Mead is lowering because of drought and water overuse.
True
False
Which of the following is evidence the Colorado River is dying (running low on water).
Humans are overusing the river.
There is not enough snowmelt refueling the river each year.
The water level of the river is lowering.
All of these are correct.
Which is a NEGATIVE (bad) effect of the Hoover Dam?
The dam generates A LOT of electricity.
Plant and animal habitats were destroyed when the Colorado River flooded behind the dam.
The dams gives Las Vegas a much needed freshwater supply.
Which of the following is a positive effect of the Hoover Dam?
The dam generates A LOT of electricity.
Plant and animal habitats were destroyed when the Colorado River flooded behind it.
The dam disrupts the natural flow of the Colorado River so it no longer flows to the ocean.
The water on Earth is mostly freshwater.
True
False
We can only use a small amount of the freshwater on Earth because...
It is stuck in glaciers and groundwater we cannot use.
It is stuck in rivers and lakes we cannot use.
It is in our kitchens and bathrooms stuck inside our faucets.
Of all the water on Earth only about ____ is freshwater we can use.
97%
20%
1%
10%
How can renewable energy options like solar power and hydropower help slow or stop climate change?
They use unlimited resources like the Sun and the wind.
Once setup, they need little or no maintenance.
They do not produce greenhouse gases.
All of these are correct
