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WorksheetsSMS 8th Blue Hydrosphere
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
Which best describes how the total amount of water present in the hydrosphere varies over time?
a)
Amount of water decreases over time due to evaporation
b)
Amount of water stays the same, but the form changes
c)
Amount of water increases due to process of precipitation
d)
Amount of water decreases and increases due to competing
2.
Which is the main source of nutrient delivery for many ocean species?
a)
upwelling currents
b)
wave action
c)
tide pull action
d)
underwater volcanic eruptions
3.
Which is the optimum pH range for freshwater fish?
a)
1.0 to 2.5
b)
3.5 to 5.0
c)
5.5 to 7.5
d)
9.5 to 14.0
4.
Which best explains the effect an increase in temperature has on a freshwater stream?
a)
It causes the water to become less acidic.
b)
It decreases the ability of water to absorb gases.
c)
It causes the water to become more acidic.
d)
It increases the ability of water to absorb gases.
5.
Which activity is most likely to directly pollute local streams?
a)
crop rotating
b)
gravel mining
c)
automobile manufacturing
d)
hog farming
6.
Which best explains why upwellings are beneficial to sea life?
a)
Bring warm waters to the surface.
b)
Help sea creatures move more quickly through strong currents
c)
Bring needed nutrients to surface to feed ocean life-forms.
d)
Create turbidity currents that muddy the water
7.
Which best explains why there is higher salinity near the equator than in coastal regions?
a)
Water temperature higher, increase evaporation, leave salt
b)
Ocean deeper at equator lead to higher concentration of salt
8.
Which best describes the effect agriculture can have on the health of a river system?
a)
Topsoil can be moved onto farmlands during floods.
b)
Runoff from fertilizers and pesticides can pollute the river
c)
Seeds from the farm plants can germinate in the river.
d)
Farm animals can use the river as a source of drinking water
9.
Which best determines the health of a lake used as a source of freshwater?
a)
its depth and width
b)
its location and depth
c)
its temperature and pH
d)
its temperature and depth
10.
In which oceanic zone do clams and crabs survive by burrowing in the sand?
a)
Intertidal
b)
oceanic
c)
deep ocean
d)
open ocean
11.
If a body of water has a high turbidity levels, what can most likely be concluded?
a)
It is unsafe to drink
b)
It has a low pH
c)
It is too hot to drink
d)
It contains a lot of chemicals
12.
Which best describes the characteristics of a river basin?
a)
land formed as a result of a river flooding
b)
land at the mouth of river where water flows into the ocean
c)
land formed when rivers create estuaries and marshes
d)
land drained by a river and its tributaries
13.
Which factors can have the greatest effect on the health of a river system?
a)
type of soil and salinity
b)
nitrate levels and turbidity
c)
human consumption and pH
d)
natural disasters and tidal changes
14.
Why is water from an aquifer more likely to be cleaner than water from other sources?
a)
because it forms where fresh & salt water meet
b)
because it receives water directly from precipitation
c)
because it receives water directly from precipitationbecause pollutants are filtered by rock & soil within earth
d)
because it rises to the surface near the ocean
15.
Based on the data, which can be inferred about the relationship between temperature and DO?
a)
An increase in temperature causes no change in the DO level.
b)
A decrease in temperature causes a decrease in the DO level.
c)
A decrease in temperature causes an increase in the DO level
d)
A increase in temperature causes an increase in the DO level
16.
Which sample site is least likely to be a healthy aquatic habitat?
a)
Site 1
b)
Site 2
c)
Site 3
d)
Site 4
17.
In which month would the dissolved oxygen level most likely be the lowest?
a)
January
b)
July
c)
March
d)
September
18.
On which day was the water most acidic?
a)
Day 1
b)
Day 2
c)
Day 3
d)
Day 4
19.
Which organism would be most negatively affected by a drought?
a)
beetle
b)
fox
c)
grass
d)
mouse
20.
How do scientists know that some mountains were once at the bottom of an ocean?
a)
freshwater rivers flow to the ocean
b)
saltwater fish are found in some mountains and streams
c)
dinosaur bones have been discovered in the mountains
d)
marine fossils have been found on peaks of some mountains
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