8th Grade Science EOG Review #1

Front

What makes 97% of the water on Earth unfit for drinking? A. It is highly saline. B. It is frozen. C. It has a low density. D. It has a high specific heat.

Back

It is highly saline.

Front

A researcher measures the pH of the lake water as 5.3. Which conclusion correctly describes the effect on aquatic species if additional acidic water is released into the lake?

Back

The pH of the lake will decrease, making the water more suitable for the survival of salmon.

Front

Which step of water treatment requires an addition of chlorine? A. aeration of water, B. disinfection of water, C. filtration of impurities, D. sedimentation of impurities

Back

disinfection of water

Front

Which statement correctly describes the behavior of dissolved gases in each of the two regions (X and Y) as ocean depth increases? A. Region Y would contain more dissolved gases than region X as the water is deeper and colder. B. Region X would contain more dissolved gases than region Y as the water is deeper and colder. C. Region Y would contain more dissolved gases than region X as the water is shallower and warmer. D. Region X would contain more dissolved gases than region Y as the water is shallower and warmer.

Back

Region Y would contain more dissolved gases than region X as the water is deeper and colder.

Front

Which city(ies) need(s) to be concerned with potential algal blooms caused by the excess nitrate and phosphate pollution, and why? Options: A. Fayetteville; the pollution will only affect the city that is closest to the source. B. Raleigh and New Bern; the pollution will travel both upstream and downstream within the river basin. C. New Bern; the pollution will only travel downstream within the river basin. D. Fayetteville and Wilmington; the pollution will travel directly south regardless of the river basin in which the source is found.

Back

New Bern; the pollution will only travel downstream within the river basin.

Front

What is Natural Selection?

Back

The process were organisms better adapted to their environment tend to survive and produce more offspring.

Front

If a lake has excess levels of phosphates and nitrates in its water, what will most likely result?

Back

The growth of algae in the lake will increase.

Front

What effect does the water cycle have on the total amount of water on Earth?

Back

The total amount of water on Earth remains relatively constant.

Front

Where is most of Earth’s freshwater located?

Back

in the ice caps

Front

In some environments, wolves prey on deer for their source of food. If all of the wolves were taken from the environment, what would most likely happen to the deer population?

Back

The deer population would increase and begin to compete for food.