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Worksheets8th Grade Science Review, Part 1
Total questions: 18
Worksheet time: 9mins
The scientist Alfred Wegener hypothesized that all the continents were once joined together in a single landmass and have since drifted apart. This theory became known as
continental drift.
continental mass.
land drift.
land movement.
Why does a red tomato appear red?
It absorbs red wavelengths of light.
It reflects red wavelengths of light.
It refracts red wavelengths of light.
It transmits red wavelengths of light.
The diagram shows the waveforms for two sounds. Which statement about sound A and sound B is correct?
Sound A is louder because its frequency is greater.
Sound A is louder because its amplitude is greater.
Sound B is louder because its frequency is greater.
Sound B is louder because its amplitude is greater.
Scientists use fossils to reconstruct extinct organisms and compare them to modern organisms. The process by which all the different kinds of organisms have changed over long periods of time is called
sedimentation.
replacement.
deposition.
evolution.
When a light wave hits a surface, part of the wave bounces back in a process called
reflection.
refraction.
resonance.
repulsion.
Which experimental observation would demonstrate the uniformity of gravitational force on an object at Earth’s surface?
the constant downward displacement of a falling body
the constant downward velocity of a falling body
the constant downward acceleration of a falling body
the increasing downward acceleration of a falling body
You are planning an experiment to observe the relationship between magnetism and electricity. What question will least help you focus your research?
How can I use electricity to change the strength of a magnetic field?
What is needed to make Earth’s most powerful electromagnet?
Can an electrical charge reverse the direction of a magnetic field?
What happens to the magnetic field if I turn off the electricity?
Refraction is the bending of light waves due to a change in
amplitude
wavelength
speed
frequency
A sound wave is an example of a mechanical wave because a sound wave requires
a mechanical device to be heard.
a medium through which to travel.
empty space through which to travel.
a standing wave to be produced.
Imagine an object is at rest. If two forces push on the object in the same direction, what must be true about the motion of the object?
The object must remain at rest.
The object must move at constant velocity.
The object must accelerate in the direction of the forces.
The object must accelerate in the direction opposite the forces.
Suppose you throw a ball across a field, and the ball lands 10 m away from you. If you throw the ball again but with a much greater force you can expect
the ball will travel the same distance.
the ball will travel a shorter distance.
the ball will travel a greater distance.
the ball will travel half the distance.
A fossil record can provide evidence of all the following except the
environments in which organisms lived.
genes of past life forms that are now extinct.
past climates of different regions.
extinctions of many kinds of organisms.
An electric current produces
a magnetic domain.
a magnetic field.
an electrical resistance.
a permanent magnet.
What are fossils?
molds and casts of organisms that live today
soft parts of ancient animals and other organisms
footprints or burrows of small animals that live today
the preserved remains or traces of organisms that lived in the past
What is the movement of rock particles by ice, wind, water, or gravity called?
abrasion
erosion
weathering
uniformitarianism
Which of the following statements is true?
The revolution of Earth around the sun explains the occurrence of eclipses.
Earth’s rotation in relation to the positions of the sun and moon are responsible for the occurrence of tides.
The moon’s revolution around Earth explains the apparent movement of constellations in the night sky.
The moon’s elliptical orbit is responsible for the occurrence of tides.
Metamorphic rock changes to igneous rock by first going through which process?
deposition
crystallization
erosion
melting
Which of the following is not considered a factor that affects the process of natural selection?
overproduction
negative feedback
variation
competition
