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Worksheets7th Grade Science DCA Review
Total questions: 95
Worksheet time: 1hrs 5mins
What does most every living thing need to survive?
Steam
Ice
Plasma
Liquid water
What happens if a planet is too hot?
The water will be nice and warm
The water will boil away
The water will be too cold
The water will freeze and make ice
What happens if a planet is too cold?
The water will be nice and warm
The water will be cold
The water will boils away
It will be like a giant snowball
What keeps the planets in orbit around the sun?
gravity
friction
density
distance
What two things determine the gravity of an object?
mass & weight
mass & distance
density & mass
volume & distance
When will the forces of gravity between two objects be the GREATEST?
when the masses of both objects are small and the objects are far apart
when the masses of both objects are large and the objects are close together
when the masses of both objects are small and the objects are close together
when the masses of both objects are large and the objects are far apart
Which has a STRONGER force of gravity, the Earth or the Moon?
Earth
Moon
Which model has greater gravitational attraction.
Model A
Model B
Model A and B have the same amount of gravitational attraction.
What celestial body is the center of our solar system, around which every object orbits?
The Sun
Earth
Moons
Asteroid Belt
Which of the following planets could be accurately described as rocky, terrestrial, and relatively close to the Sun?
Mars
Jupiter
Saturn
Neptune
The table provides information of various objects in our solar system. Based on the information in the table, which object is a COMET?
A
B
C
D
All of the outer planets share which of the following characteristics?
Mostly made up of gas.
Rocky and terrestrial
Smaller in size compared to other planets
Closest to the Sun
The Sun is best described as -
A very large planet
A hot dense rock
A collection of comets
A medium sized star
An object that orbits a planet would best describe -
A comet
A meteor
The Sun
A moon
Most of the asteroids in our solar system are located between the orbits of what two objects?
The Sun and Earth
Earth and Mars
Mars and Jupiter
Saturn and Uranus
Planets in our solar system orbit the Sun because it –
Has the greatest magnetic field
Is the brightest object in our solar system
Is the celestial body with the greatest mass
Formed millions of years before the planets
According to the Law of Superposition, the oldest rock layers are found...
at the top of the rock layers
in the middle of the rock layers
near an intrusion
always at the bottom of the rock layers
According to the Law of Superposition which letter represents the oldest layer?
E
D
C
B
A
Analyze the seashell found in the white layer. Which statement is true of the rock layer that contains this fossil?
The white layer could also contain a fossil from the top layer and the bottom layer
The white layer is younger than the layers above it.
The white layer is older than the layers above it.
The white layer is older than the layers below it.
Is the rock layer with the trilobite fossils older or younger than the rock layers with the dinosaurs fossils?
older
younger
the same age
What geologic principle(or law) is best displayed here?
The Law of Superposition
Intrusion
Extrusion
Breaks in the crust called __________ form where plates meet.
mountains
rift valleys
faults
trenches
Plates slide past each other at _________________ boundaries.
divergent
convergent
transform
universal
________________ currents drive Earth's plate movement.
ocean
atmosphere
wind
convection
The San Andreas fault is an example of which type of boundary?
transform
divergent
convergent
universal
Which feature forms at convergent boundaries?
trench
rift valley
mountain range
mid-ocean ridge
What type of plate boundary is pictured above?
Convergent
Transform
Divergent
How are divergent and convergent boundaries different?
Divergent boundaries involve plates sliding past each other, while convergent boundaries involve plates moving apart.
Divergent boundaries involve plates moving apart, while convergent boundaries involve plates colliding or coming together.
Both involve plates moving away from each other, but only divergent boundaries create new crust.
Both involve plates colliding, but only convergent boundaries cause earthquakes.
Fossils of now-extinct dinosaurs have been found on continents separated by ocean. The dinosaurs could not swim or fly. What does this suggest about the continents?
The continents were once connected.
A land bridge once connected the continents.
The same type of animals evolved on both continents.
Prehistoric man transported the dinosaurs between the continents.
Shark teeth were discovered in an area where there was no source of water. What is the BEST explanation for this?
Sharks used to live on flat land.
The area was once covered with salt water.
The area was once covered with freshwater.
Someone buried the shark teeth deep in the ground.
Tree fossils were found in the desert. What can we infer about the tress and the land where the fossils were found?
Trees adapted to live in the desert.
The tress are extinct now, but used to live in the desert.
This area has many trees because it has always been a desert.
The area was once home to many trees and has not always been a desert.
What type of boundary does this show?
Converging Transform
Convergent
Divergent
Transform
At which type of boundary do plates slide past one another as shown in this diagram?
Divergent Boundary
Transform Boundary
Convergent Boundary
The Pacific Ocean basin is the oldest, largest, and deepest of the existing ocean basins in the world. Its area is about 59 million square miles and all of the continents could fit into it. At this location, plates are moving apart from one another. Ocean basins form at which type of plate boundary?
Transform
Divergent
Convergent
One of the major boundaries in the world is on the North American Plate along the San Andreas fault system in California. Which type of geologic event is most likely to occur along this boundary?
Volcano
Mountain
Earthquake
Ocean Basin
A divergent boundary occurs when plates ....
Pull apart
Come together
Slide past each other
subducting
Evidence that Pangaea was once a supercontinent:
Global Warming
Fossils and glacial scars
Ocean temperature
Volcanoes errupting
The name for the one supercontinent that existed millions of years ago with the shifting of earth's plates is:
Crustation
Venus
Earth
Pangaea
The movement of earth's plates that moved our continents into different places is called :
Sedimentation
Continental Drift
Oceanic Shift
Rolling Plates
The East African Rift is an example of what type of plate boundary?
Convergent
Divergent
Transform
The Mid Atlantic Ridge and Iceland are an example of what type of plate boundary?
Convergent
Divergent
Transform
Hotspots are often found at a divergent plate boundary. Why is this?
Where the plates separate is a great source of magma and lava
Where the plates come to together is a great source of magma and lava
Thermal energy is transferred from————-
A cooler object to a hotter one
A hotter object to a cooler one
Molecules with more kinetic energy move ———- than molecules with less kinetic energy
Lower
Faster
Higher
Slower
What type of thermal energy transfer is warming the man from the fire?
Convection
Conduction
Radiation
Heat
What type of thermal energy transfer is occurring at point C?
Convection
Conduction
Radiation
Heat
What type of thermal energy transfer is occurring at point B?
Convection
Conduction
Radiation
Kinetic
How does the mass of a particle affect its speed at the same temperature as another particle?
more massive particles move faster
less massive particles move faster
particles with larger mass and volume move faster
both particles move at the same speed regardless of mass
What does kinetic energy measure in particles?
the amount of space particles take up
the movement speed of particles
the shape of the particles
the temperature difference between particles
If two samples have particles with different kinetic energies, what does this difference tell you about the samples' temperatures?
The sample with higher kinetic energy has a higher temperature
The sample with lower kinetic energy has a higher temperature
Both samples have the same temperature
Temperature is unrelated to kinetic energy
Imagine Sample X and Sample Y both contain the same substance. The particles in Sample X are moving faster than those in Sample Y. What does this imply about the temperature of Sample X?
Sample X has a lower temperature than Sample Y
Sample X and Y have the same temperature
Sample X has a higher temperature than Sample Y
The temperatures cannot be compared
What effect does an increase in temperature have on the kinetic energy of particles in a solid?
It decreases kinetic energy, causing particles to contract
It increases kinetic energy, causing particles to move further apart
It has no effect on kinetic energy
It makes each particle smaller
What is thermal energy that is transferred through empty space?
Conduction
Convection
Radiation
Insulator
What is thermal energy that is transferred when two objects of different temperatures touch?
Conduction
Convection
Radiation
Insulators
What is the transfer of heat by the movement of currents of liquid or gas?
Conduction
Convection
Radiation
Insulators
Microwave
conduction
convection
radiation
Roasting a marshmallow
conduction
convection
radiation
Convection
heat transfer through empty space
heat transfer by direct contact
heat transfer by heat rising and cold sinking
spoon in the soup
conduction
convection
radiation
Ironing
conduction
convection
radiation
conduction
convection
radiation
Conduction
heat transfer by Touch
heat transfer by heat rising and sinking (Fluids)
heat transfer by Not Touching
A change that results in the formation of new chemical substances
chemical change
physical change
The formation of a solid when two liquids combine is called?
Solidification
Freezing
Precipitate
Solubility
The following are examples of evidence of a chemical reaction....
ice melting into a liquid
condensation
endothermic reaction
change in color, production of gas bubbles
Which is NOT evidence of a chemical change?
Unexpected color change
gas produced
breaking
light produced
Which is NOT evidence of a chemical change?
Unexpected color change
gas produced
melting
temperature change
Which of the following options provides evidence of a CHEMICAL change?
Wood is burned releasing ash and smoke
Rocks separate when soil is sifted
Boiling water bubbles when heated
Salt dissolves in water
After an investigation, students were disposing of left over substances. One student poured all of the liquids down the sink drain. A few seconds later, a white cloud formed above the sink and the student’s eyes began to burn.Which statement accurately describes what caused this occurrence?
The student did not wait two minutes in between pouring each liquid down the drain.
The student did not allow water to run in the sink after pouring each liquid down the drain.
A physical change occurred resulting in the formation of a new substance.
A chemical change occurred resulting in the formation of a new substance.
Change which alters the physical properties of a substance without changing its identity.
Chemical Change
Temperature Change
Physical Change
None of the above
Which of the following is an example of a chemical change occurring?
Tearing a piece of paper
Grinding something into powder
Glass breaking
The leaves changing color in fall
To show a chemical change, I hold a spoon full of sugar over a small flame. What would be the best evidence that a chemical reaction has occurred?
The sugar gets hotter
The sugar gets colder
The sugar melts into a liquid
The sugar turn a black color
A student observed bubbling and fizzing occurring during an experiment. What can the student conclude?
A physical change occurred
A chemical reaction produced a gas
A chemical reaction produced a solid
Nothing changed
How many hydrogen atoms in 2H20?
2
4
6
How many oxygen atoms in 2H20?
2
4
6
How many carbon atoms in 2C6H12O6 ?
2
6
8
12
How many oxygen atoms in 2C6H12O6 ?
2
6
8
12
How many different elements are present in NaCl?
1
2
3
4
How many different elements are present in H2COCH2?
5
4
3
2
How many total potassium (K) atoms are in this formula: 4K2CO3?
2
4
6
8
How many total carbon (C) atoms are in this formula: 4K2CO3?
2
4
6
8
How many total oxygen (O) atoms are in this formula: 4K2CO3?
12
4
3
7
How many oxygen (O) atoms are in 2Na2O?
0
1
2
3
How many atoms of Hydrogen are in this equation?
5Cl2H5
10
2
5
25
