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WCAS 8th Grade Review
WCAS 8th Grade Review
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prepare for 8th grade science WCAS Test
Flashcards
55 cards
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Questions
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Answers
1
fill in the blank convergent means _________
dividing
subduction
sliding
colliding
2
An object at rest stays at rest until an unbalanced force acts on it, which law is this?
1st
2nd
3rd
3
An organism that feeds off of another organism, in order to survive(e.g., tick, flea, tapeworm)
parasite
prey
predator
host
4
The following organisms are producers because they contain which unique organelles
cell wall and nucleus
cell wall and chloroplast
chloroplast and mitochondrion
cell membrane and chloroplasts
5
Satellites move at a constant speed around celestials bodies due to which law
1st
3rd
2nd
6
How do the Water Cycle and Rock Cycle interact?
Rocks carry water vapor up into the atmosphere
Water is removed from the upper atmosphere by the solar wind
Water enters the mantle, helping form igneous rock
Water weathers, erodes, and deposits rock as it moves
7
The valence electron number determines which of the following
similar characteristics
identity
size of the atom
proton number
8
Reactivity increases from left to right in a period
false
true
9
underwater Trenches are caused by
transform
subduction
convergent
divergent
10
What evidence do we have for the human causes of climate change?
Decreasing average human lifespans
Sharp increases in CO2 levels in recent glacial ice
Historical record shows intentional climate change in 1800s
Increase in global temperatures + increase in oil/coal use
11
Clouds of gas and dust. Sites of star formation. Remains of dead or dying stars
comet
nebulae
black hole
galaxy
12
Which form of energy is used to power the vehicle?
chemical energy
mechanical energy
solar energy
thermal energy
13
Why did Pangea break up?
Giant asteroid impact
Mass extinction of dinosaurs & other animals
Greenhouse gases
Divergent plate boundaries
14
What is the first step in the Engineering Design Process?
Design Multiple Solutions & Select One
Research Solutions
Define the Problem
Build a Prototype
15
Used for measuring the intensity of the energy of celestial objects
x rays
microwaves
light waves
radio waves
16
What are ways that climate can impact human activity?
Changing sea levels affect safety of coastal communities
Climate does not impact human activity
Different atmospheric gases make asteroid impact more likely
Changing precipitation impacts growth of crops
17
Law of conservation of mass states
Matter is created
matter is destroyed
matter is not created
matter is neither created or destroyed
18
Objects in space, made of gases, which produce their own light and heat
nebulae
planet
galaxy
star
19
What was the name of the super-continent which existed on Earth about 175 million years ago?
Faerun
Australasia
Gondwana
Pangea
20
Elements in the same period have the same number of what
neutrons
protons
energy levels
valence electrons
21
Which type of galaxy is shown below?
irregular
spiral
round
elliptical
22
In the equation 3H
2
O, the number 2 is called what
subscript
atomic number
atomic mass
coefficient
23
What is an allele?
A rogue planet traveling through the galaxy with no sun
A pair of genes which combine to produce a trait
A type of pharmaceutical made from a rare plant
Another word for a hypothesis
24
The mass of an atom is the combination of which two particles
proton and neutron
electron and neutron
proton and nucleus
electron and proton
25
97% of Earth's water is...
Frozen; contained in ice caps/glaciers
Saline; contained in oceans
Polluted
Fresh; contained in rivers
26
When you design an engineering solution, how do you know if your design is successful?
I test it once and declare success or failure based on that
I make sure to check all boxes on the worksheet
I take a survey to see if people think it looks cool
I write test criteria, then test to see if it meets them
27
If the woman in the picture does not move is work being done?
Yes
No
28
You are in a car driving and the breaks are applied, you fly forward, which Law is this?
Law of Force and Acceleration
Newton's 2nd Law
Law of Inertia
Law of Action-Reaction
29
The smallest unit of life is the
atom
cell
nucleus
organism
30
This is an eclipse but it could also be which moon phase?
third quarter
first quarter
new
full
31
tendency of a substance to undergo chemical changes in a system
reactivity
metal
conductor
frequency
32
True or false: Earth's climate & average temperatures have been constant throughout its history
False
True
33
The number of electrons in the last shell of an atom is called what
group
nucleus
period
valence
34
a system of stars and associated matter, held together by gravitational attraction
solar system
galaxy
Moon
universe
35
Volcanoes are caused by which plate tectonic boundary
transform
divergent
convergent
36
When plate boundaries form mountains this is an example of which boundary?
convergent
divergent
transform
subduction zone
37
A neutron has which charge
positive
negative
no charge
38
This crustal feature was done to prevent which of the following processes
extinction
deposition
erosion
weathering
39
Which of Newton's Law is responsible for lift off of the space shuttle?
Newton's 3rd Law
Newton's 2nd Law
Newton's 1st Law
40
Which of the following is an example of a chemical change?
crushing almonds
food coloring in water
cutting a watermelon
bubbles forming
41
distance light can travel in a vacuum in one year; equal to approximately 9.5 X 10
12
km
acceleration
light year
visible light
galaxy
42
How many hydrogen are found in this molecule? (NH
4
)
2
CO
3
8
6
9
4
43
When speed is combined with direction it is called which of the following
velocity
distance
acceleration
constant speed
44
Which particle is found in the cloud
electrons
nucleus
neutrons
protons
45
What are pieces of evidence for the Big Bang theory?
Cosmic background radiation coming from all directions
The Earth appears to be about 4.5 billion years old
Knowledgeable scientists believe that it's true
All distant galaxies are moving away at high speed
46
Fossil record and rock correlation support this theory
newton's laws
continental drift
plate tectonics
evolution
47
What are potential costs (downsides) of mining minerals/fossil fuels?
Mining is not actually economically profitable
Mined materials may be toxic/destructive to Earth systems
Mined resources are nonrenewable
Water contamination in mined areas
48
In oceanic subduction zones, what's the main contributor to the melting of oceanic crust?
Friction between the plates increases heat
Subterranean rock men are trying to attack us
Radioactive elements in the subducting plate increase heat
Increased depth within the mantle
49
Which subatomic particle has a positive charge?
proton
electron
neutron
nucleus
50
Which change would cause rocks from Earth's mantle (solid) to melt into magma (liquid)?
The Scientific Method.
Increased pressure, reduced temperature
Reduced pressure, increase in water content
Decreased water content, decreased temperature
51
Sun is a medium-sized star near the edge of a disc-shaped galaxy of stars
True
False
52
The mass (g) of substances in the reactants is equal to the mass of substances in the
equation
products
subscript
coefficient
53
Genetically altering the DNA of a plant or animal is called
alternation of generation
selective breeding
natural selection
evolution
54
the formation of solids from a solution
solidification
melting
precipitate
freezing
55
What is the single biggest contributor to weathering on Earth's surface?
Fire
Gravity
Wind
Water
