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8th Grade Science Review Flashcards | StudBud
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8th Grade Science Review
8th Grade Science Review
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Earth Science Final
Flashcards
45 cards
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Practice quiz
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Host live
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Questions
45
Answers
1
What is one piece of evidence that continental drift exists?
shape of the continents
rocks
climatic evidence
fossil fuels
2
How long does it take the Earth to complete one revolution ?
365 days
365 1/2 days
one year
365 1/4 days
3
Plate tectonics says that Earths surface is made up of tiny moving slabs named tectonic plates
true
false
4
A large cold cloud of gas and dust in interstellar space is called a red shift
true
false
5
A revolution is one complete trip around an orbit
false
true
6
What are 3 steps scientists take to evaluate an explanation?
use research, prove evidence to be true, make
make other observations based off the evidence
look at evidence, consider explanation, test conclusions
use other evidence, make a conclusion, ask other scientists
7
How many valence electrons do nitrogen atoms have?
3
11
5
7
8
The sun is a a super giant star
true
false
9
Which of the following can happen during a chemical exchange?
all of the electrons in the atom are lost
bonds break, and new bonds form
atoms gain or lose protons and change into new atoms
nuclei of atoms separate and the subatomic parts combine
10
Force
a push or a pull
a push or a pull on an object
all forces being applied to an object at once
the speed and direction of an object combined
11
A dependent variable relies on the independent variable
false
true
12
What is the distance of a light year?
9.6 trillion
9.7 trillion
9.5 trillion
10.5 trillion
13
What is an independent variable?
the Y axis
the X axis
the variable that is manipulated in the investigation
the variable that has no dependent variable attached to it
14
What is a distance-versus-time graph used to describe?
acceleration
speed
position
velocity
15
What results in the sea floor
plate tectonics
sea floor spreading
oceanic volcanoes
continental drift
16
What is the alignment of the sun earth and moon during a spring tide?
sun, earth, moon from 45-degree angle
sun, earth, moon from 90-degree angle
sun, earth, and moon
sun, earth, moon from 135-degree angle
17
What is a ecosystem?
contains living an non living that's interacting together
a large region of organisms
an area with biodiversity
none of the above
18
A parasitism is a relationship that prey/host shares.
False
True
19
A chemical bond joins electrons in an atom together
True
False
20
Continental drift is the hypothesis that today's continents were once a single land mass
true
false
21
What is the mean for a data set?
the most common #
the average of a set
the difference between the largest # and smallest #
the middle # in the data set
22
Economics have an affect on science
true
false
23
Jet streams are the apparent curving of winds due to Earth's rotation
true
false
24
The apparent curving of winds due to Earth's rotation is the Coriolis effect
true
false
25
What is a biotic factor?
producers of an ecosystem
living parts of an ecosystem
nonliving parts of an ecosystem
consumers of an ecosystem
26
Who proposed the hypothesis of continental drift?
Antonio-Snider Pellegrini
Alexander Humboldt
Fredrick Vine
Alfred Wegener
27
What does the first quarter moon look like?
moon shaped circle
moon shaped half circle
no moon
moon shaped crescent
28
What is a decomposer?
eats other organisms
nonliving parts of an ecosystem
an organism that breaks down the remains of organic matter
a parasite
29
Weather forecasting is the study of weather and Earth's atmosphere to predict the precipitation
false
true
30
What is a star?
something in space composed of gas and dust
the sun
a thing in the sky that appears small and bright
celestial body made of gas and emits light
31
What is the correct definition of science
a collection of facts
the study of the earth
study of living things
systematic study of natural events and conditions
32
What is wind?
air movement caused by differences in air pressure
high-speed winds between 7km and 16 km
something caused by the oceans
apparent curving winds due to Earth's rotation
33
The spin of a planet or moon as seen from above a planet's pole is called its rotation
true
false
34
What is an atom?
bigger than an element but smaller than a particle
smallest particle that an element can be to remain the same
same thing as a particle
the smallest known element in the world
35
How do you find the net force of an object?
subtract smaller force from larger force
add both forces together
find the mode of both forces and add them together
subtract the negative force from the positive force
36
An abiotic factor is nonliving
False
True
37
What is a galaxy?
stars
dust
stars gas and dust
gas and dust
38
What is inertia?
the tendency of an object to resist a change in motion
the rate at which velocity changes over time
a series of laws developed by Isaac Newton
an unbalance force that opposes motion
39
Velocity and acceleration are not vector quantities
true
false
40
What is the range?
the middle # in a data set
the average of the data set
difference between the smallest and l #s in a data set
the most common # in a data set
41
What are ocean currents?
currents in open ocean water
waves on the ocean's surface
the movement of water throughout the planet
streamlike movements in of water in the ocean
42
What is a theory?
a hypothesis
ideas that explains related observations
an estimated guess
a scientific idea
43
In the Bohr model of an atom, valence electrons are shown in the BLANK energy level?
innermost
middle ring
outermost
there aren't valence electrons in this specific model
44
How are repetition and replication alike?
they are alike at all
they are the same thing
they both make a science experiment become a replicate
they both involve the repetition of a science experiment
45
What is the median for a data set?
the difference from the largest # to the smallest #
the average of the data set
the middle # of a data set
the number that occurs most frequently
