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WorksheetsMid Term Exam 8th Grade Science
Total questions: 74
Worksheet time: 37mins
Plants use water to
release a waste product
keep predators away
make their own food
attract pollinators
Approximately what percentage of Earth’s water is fresh water?
97 percent
71 percent
20 percent
3 percent
The streams and small rivers that feed into a main river are called
watersheds
tributaries
divides
wetlands
The water in ponds and lakes is
moving
deep
still
salty
As water moves slowly through a wetland, some waste materials settle out, some wastes are absorbed by plants, and silt and mud is trapped by plant roots. In this way, wetlands act as natural
filters
habitats
tributaries
artesian wells
Water that fills the cracks and spaces in underground soil and rock layers is called
saltwater
rainwater
groundwater
water vapor
Water that falls to Earth as rain, snow, sleet, or hail is called
condensation
evaporation
precipitation
transpiration
A lake that stores water for human use is called a(n)
reservoir
dam
oxbow lake
pond
People can obtain groundwater by drilling a well
above the water table
into an aquifer
into the unsaturated zone
into the impermeable layer
Wetlands provide habitats for many living things because of their sheltered waters and
large supply of nutrients
thick layer of mud
lack of insects
ability to prevent floods
A river system is made up of a river and its
sediments
divides
runoff
tributaries
An aquifer is a(n)
an underground layer of rock or sediment that holds water.
well in which water rises because of pressure.
type of hot spring from which the water periodically erupts.
place where groundwater bubbles or flows out of cracks in the rock
A well in which groundwater rises because of pressure is called a(n)
artesian well
geyser well
spring well
dry well
What percent of our atmosphere is made up of gases other than oxygen and nitrogen
5 percent
1 percent
10 percent
2 percent
Which of the following describes an example of the atmosphere acting as a system?
its layered structure
global wind patterns
its composition
deep ocean currents
The less mass in a given volume of air, the
more the air weighs
greater the air pressure
more dense the air
less dense the air
Instruments used to measure air pressure are called
thermometers
hygrometers
hydrometers
barometers
As you rise upwards in the atmosphere, air pressure
increases
decreases
doesn't change
first increases, then decreases
The layer of our atmosphere in which weather occurs is the
troposphere
stratosphere
mesosphere
exosphere
The greenhouse effect is
the absorption of energy by clouds.
a gradual increase in the temperature of the atmosphere.
the reflection of solar energy into the atmosphere.
the process by which gases hold heat in the atmosphere.
Cool air tends to
be less dense and flow over warm air.
be lifted up by more dense warm air.
be more dense and flow under warm air.
mix easily with warm air masses.
Local winds differ from global winds because they
are caused by unequal heating within a small area.
are caused by differences in cloud cover.
are due to unequal rainfall.
are not influenced by air masses.
Earth’s rotation makes global winds curve. This is called the
convection effect
global effect
coriolis effect
rational effect
Ozone is
a form of oxygen with three oxygen atoms in each molecule.
a form of nitrogen with three nitrogen atoms in each molecule.
a form of oxygen with two oxygen atoms in each molecule.
a form of nitrogen with two nitrogen atoms in each molecule.
Density can be determined using the formula
density = mass/volume.
density = volume/mass.
density = mass • volume.
density = mass + volume.
The layers of the atmosphere are classified according to changes in
altitude
density
pressure
temperature
From Earth to space, the main layers in our atmosphere are:
troposphere, stratosphere, mesosphere, thermosphere.
stratosphere, troposphere, mesosphere, thermosphere.
mesosphere, troposphere, stratosphere, thermosphere.
thermosphere, troposphere, stratosphere, mesosphere.
The lowest and shallowest layer of the atmosphere is the
troposphere.
stratosphere
mesosphere.
thermosphere
The ozone layer is found in the
troposphere
stratosphere
mesophere
thermosphere
The ozone layer protects living things on Earth from
visible light
infrared rays
ultraviolet radiation
carbon dioxide
The layer of the atmosphere between the stratosphere and the thermosphere is called the
troposphere
ionosphere
mesosphere
exosphere
Which layer of the atmosphere protects Earth’s surface from being hit by most meteoroids?
troposphere
stratosphere
mesosphere
thermosphere
The prevailing westerlies, the major wind belts over the continental United States, generally push air masses from
east to west.
west to east.
north to south.
south to north.
What is the most abundant salt in sea water?
sodium chloride
magnesium chloride
calcium chloride
potassium chloride
A deep canyon in the ocean floor is called a(n)
abyssal plain
seamount
trench
continental shelf
As you descend through the water column,
temperature decreases.
pressure decreases.
light increases.
density decreases.
As a wave nears shore, the wave height increases and the wavelength
decreases
increases
stays the same
doubles
The lowest point of a wave is the
crest
wavelength
trough
frequency
When a tsunami hits the shore, it can be very destructive because of its large
sandbar
trough
wave height
frequency
Dunes reduce beach erosion because
they cause the tides to go higher.
they cause waves to break offshore.
the roots of dune plants hold sand in place.
they prevent people from walking on the beach.
What causes cold, deep currents to form in the oceans near the poles?
sinking of dense, cold water with high salinity
the Coriolis force
movement of a large mass of warm water across the Pacific
sinking of cold, freshwater from melting icebergs
A large stream of moving water that flows through the oceans is called a(n)
current
tsunami.
tide
undertow
In which zone is ocean temperature most affected by the weather?
transition zone
deep ocean
surface zone
polar zone
A rush of water that flows rapidly back to sea through a narrow opening is called a
longshore drift
breaker
tsunami
rip current
To reduce erosion along a strip of beach, you might build a short wall called a
dune
barrier beach
groin
sandbar
Salinity is a measure of which of the following in water?
carbon dioxide
oxygen
dissolved salts
sand
The densest ocean water is generally found
in the surface zone.
in the transition zone.
in the deep zone.
along the coast.
Which of the following is true of El Niño?
El Niño occurs at the same time as La Niña.
El Niño affects only the ocean, not the land.
El Niño can cause unusual and often severe weather conditions.
El Niño usually occurs twice a year.
Benthos are organisms that live
on the surface of water.
throughout the water column.
on the ocean floor.
in shallow water.
Which of the following organisms is an example of nekton?
lobster
dolphin
crab
sea star
The part of the ocean that extends from the low-tide line to the edge of the continental shelf is the
netric zone
open-ocean zone
intertidal zone
deep zone
The organisms that form the base of most open-ocean food webs are
fish
coral
plankton
kelp
A nearly flat region of the ocean floor, covered with thick layers of mud and silt, is called a(n)
seamount
abyssal plain
continetal slope
mid-ocean ridge
Free-swimming animals that can move throughout the water column are called
algae
nekton
benthos
plankton
The area that stretches from the highest high-tide line on land out to the point on the continental shelf exposed by the lowest low tide is called the
intertidal zone
netric zone
estuary zone
deep zone
What is the name of the process by which water vapor enter the atmosphere during the water cycle?
condensation
evaporation
precipitation
convection
Relative humidity can be measured with a(an)
anemometer
barometer
physchrometer
thermometer
Two conditions are required for cloud formation: cooling of the air and
the absorption of infrared energy.
the unequal heating of Earth’s surface.
the presence of particles in the air.
the influence of the Coriolis effect.
Very high feathery clouds are called
stratus clouds.
cumulonimbus clouds.
cirrus clouds
nimbostratus clouds.
On average, a snowfall of 20 centimeters would equal a rainfall of
1 centimeter
2 centimeter
3 centimeter
4 centimeter
Cold, dry air affecting the northern United States in winter often comes from
maritime polar air masses.
maritime tropical air masses.
continental polar air masses.
continental tropical air masses.
Weather associated with an anticyclone is generally
cloudy but dry.
unpredictable.
wet and cloudy.
dry and clear.
Small lines at the end of the shaft that represents wind direction on a weather map indicate
air temperature.
wind speed.
air pressure.
relative humidity.
The collecting of weather data in the last 40 years has been improved mostly by
balloons and satellites.
more people who study clouds.
military aircraft.
astronaut observations.
The most dangerous aspect of a snowstorm is often the
high winds
depth of snow
brightness
air temperature
Large clouds that often produce thunderstorms are called
stratus clouds.
cumulonimbus clouds.
cirrus clouds.
nimbostratus clouds.
Any form of water that falls from clouds is called
dew
evaporation
condensation
precipitation
When a warm air mass and a cold air mass meet and neither can move the other, the result is a(n)
occluded front
warm front
stationary front
cold front
A major difference between cyclones and anticyclones is
their size
where they occur
the directions of their winds
how often they occur
A funnel-shaped cloud that touches Earth’s surface is called a
hurricane
cyclone
tornado
thunderhead
Isobars are lines on a map joining places that have the same
wind speed.
temperature
humidity
air pressure
What kind of weather would a continental tropical air mass that formed over northern Mexico bring to the southwestern United States?
monsoon rains
warm and moist
cold and moist
hot and dry
When a warm air mass overtakes a cold air mass, it forms a(n)
occluded front
warm front
stationary front
cold front
One example of a safe place to be during a thunderstorm is
riding in a boat.
swimming in a lake
sitting under a tree
crouching in a low area
