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Science 8 - Fresh and Salt Water Systems Topics 1-6 Flashcards | StudBud
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Science 8 - Fresh and Salt Water Systems Topics 1-6
Science 8 - Fresh and Salt Water Systems Topics 1-6
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Grade 8 Science Unit 5- Fresh and Salt water systems
Flashcards
36 cards
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Practice quiz
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Questions
36
Answers
1
What causes an algal bloom?
too much pollution in the water
a rapid growth of swamp plants in the water
an abundance of nutrients in the water
a lack of nutrients in the water
2
What are adaptations?
A way an organism acts that keeps it alive.
How organisms behave in a new environment.
The way an organism changes.
Any characteristic of an organism that help it survive.
3
A winding ridge of sand and gravel left behind by a retreating glacier is called _______________________.
a morraine
a outwash
a till
an esker
4
Hard water contains __________________.
carbon dioxide
vibranium
only hydrogen and oxygen
calcium and magnesium
5
Ocean currents originating at the equator are...
warm currents
cold currents
6
Which
best
describes a bioindicator?
a species that is sensitive to changes in its environment
a species that has been introduced to an ecosystem
a species that can adapt to a variety of conditions
a species that has a short life span
7
25% of Albertans depend on groundwater for their water supply.
True
False
8
The Earth's water cycle is very important because it controls ________________.
the salinity of water
the quality of the water
the temperature of the water
where water is distributed on Earth
9
How much of the human body is made of water?
50%
95%
10%
65%
10
Industrial waste causing contamination is an example of a ______________________.
Groundwater
Point Source
Direct Outflow
Non-Point Source
11
How often is water moving through the water cycle?
Always
Every 2 hours
Never
Once a day
12
Biomagnification is...
when toxin concentrations increase as you move up the food chain
instant death
when toxin concentrations decrease moving up the food chain
the study of microscopic biology
13
What is desalination?
when the corral bleaches and dies
the removal of salt from water
the removal of bacteria from the water
adding salt to water
14
What is thermohaline circulation?
deep ocean currents driven by temperature
deep ocean currents driven by water density
surface currents driven by wind
surface currents driven by temperature
15
An aquifer refers to
surface runoff
underground water
polluted water
water that infiltrates soil
16
A large crack in the glacier is called a ____________________.
a crevasse
an icefall
an ice ridge
an outflow
17
When does a spring tide occur?
in the spring
when the sun, moon, and Earth all line up
when the sun, moon, and Earth are at right angles to each other
twice a day in the spring
18
A pond can be larger than a lake.
True
False
19
Why are glaciers important?
Supplies drinking water
Compresses snow and ice
Helps with the water cycle
Storage of fresh water
20
What is neap tide?
a tide caused by the sun, moon, and Earth lining up
where there is great difference between hight tide and low tide
the best wave to surf in Kowabunga!
where there is very little difference between high tide and low tide
21
An area of land that drains water into a body of water are called.....
Freshwater system
Groundwater
Watershed
Rivers
22
A large rock that was left behind by a glacier, and is different from other rocks in the area.
Moraine
Erratic
Esker
Horn
23
What water source is found in the highest percentage on Earth?
Oceans
Ice caps and Glaciers
Rivers and Lakes
Groundwater
24
A lake affected by algal bloom would have
lots of light
lots of fish
a small algae population
low oxygen levels
25
Emergent plants grow....
on the edge of a pond
floating on water
underwater
partially in water
26
Ocean currents will either cool or warm the air above them and the land they flow by.
False
True
27
Define ocean currents
continuous movement of ocean water in a certain direction
changes in water level due to a gravitational pull on Earth
pools of still water in the deep sea
organisms that live in ocean water
28
Ocean currents are caused by _______________________
convection currents powered by the sun
All the above
winds blowing over the water
differences in temperature and salinity
29
What is a valley glacier?
A glacier that is shaped like a valley
An ice sheet covering part of a continent
A glacier that forms in a mountain range
A crack in the ice
30
A crayfish in a freshwater environment may suggest
the water is clean
crayfish can't live in freshwater
it is an invasive species
the water may be contaminated
31
Deep ocean currents are driven by:
High amount of movement on sea floor
Harsh weather
The mixture of freshwater and salt water
Differences in temperature and salinity
32
Zonation in a tidal zone is evident by
the presence of different species along a vertical due to tides
large numbers of worms in the mud
tide pools along mud flats
the absence of plant life in black sediments
33
What is the most common cause of waves in the ocean?
wind
sun
animals
earthquakes
34
An adaptation that is beneficial for aquatic animals such as a platypus and a frog is
webbed feet
a long tail
scaly skin
feathers
35
What is an algal bloom?
The rapid growth of a population of insects
The rapid growth of a population of algae
36
What affects ocean currents?
Temperature
All of the Above
Density
Salinty
