Science 6th Grade Review Benchmark Question Preview (ID: 46879)


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Approximately 9907% of all water on Earth is found in oceans, seas, ice, and the atmosphere. Based on this information, which statement is most accurate
a) The water cycle returns all usable water to the sea
b) Less than 0.3% of Earth's water is drinkable
c) Humans are not dependent on ocean water
d) The Earth's freshwater supply is infinite.

How much of the Earth is covered in water?
a) 90%
b) 70%
c) 30%
d) 50%

Where is most of the Earth's fresh water found?
a) rivers
b) glaciers
c) streams
d) lakes

When dense, cold air pushes beneath warmer atmospheric air, the lighter, warmer air rises. As this air rises into the atmosphere, it cools and some water vapor in it condenses. Which of the following will most likely form as this occurs?
a) a tornado
b) a cloud
c) a rainbow
d) a sunset

The Energy source that powers the Earth's water cycle
a) the Sun's gravity
b) Earth's rotation
c) heat from the sun
d) radiation from Earth's core

In order for precipitation to occur on Earth, water from oceans, lakes, and rivers must
a) evaporate
b) condense
c) freeze
d) expand

Ocean water differs from freshwater in that it has
a) a higher temperature
b) a lower temperature
c) a higher concentration of sodium chloride
d) a higher concentration of silicon dioxide

When the sea floor spreads apart, volcanoes and ridges are formed because
a) sediments are deposited where the floor spreads, building ridges
b) ocean water pushes down on the surrounding sea floor, pushing ridges up
c) as the plates pull apart, magma moves to the surface, building ridges
d) underwater earthquakes lift the sea floor into long ridges

What technology is used to measure the depth of the ocean?
a) sonar
b) submarines
c) telescopes
d) radar

Which of these increases as a submarine dives deeper into the ocean?
a) the number of plants in the water
b) the freshness of the water
c) the water pressure
d) the water temperature

Which natural force creates surface ocean currents?
a) sunlight
b) gravity
c) wind
d) earthquakes

Which of these has the most influence on ocean tides?
a) the magnetic field of the Earth
b) electrical forces in the atmosphere
c) radiation from the sun
d) gravity between the Earth and the moon

The ocean water near the equator absorbs more heat throughout the year than ocean water near the North Pole. Which of the following best explains this difference?
a) The equator is closer to the sun.
b) The equator has higher sea levels.
c) The equator receives more direct sunlight.
d) The equator rotates more quickly on Earth's axis.

An air mass gets its temperature and humidity from
a) changes in the upper atmosphere
b) the land or water over which it forms
c) speeds up evaporation following precipitation
d) is a determining factor of major air movements

Cold air is more dense than warm air. When a cold air mass moves into a warm air mass, causing a cold front, the warm air mass is
a) squeezed downward, causing clouds and rain
b) forced backward, as the approaching cold air replaces it
c) compressed into a smaller mass, as it becomes even warmer
d) forced upward, where its water vapor condenses

Water in Earth's atmosphere comes mainly from
a) tropical rain forests
b) glaciers
c) underground rivers
d) the oceans

Hurricanes continue to grow and move as long as they continue to be
a) over cool ocean water
b) pushed along by wind currents
c) pushed along by water currents
d) over warm ocean water

A rock that contains a metal is known as
a) an ore
b) a crystal
c) a stalactite
d) a stalagmite

What type of material would you expect to find in the inner core of the Earth?
a) solid rock composed of mostly iron and nickel
b) liquid
c)
d)

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