AnswersVA-Earth Science CRUnit Test

Unit Test — Cumulative exam Answers

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Why are there two high tides a day about 12 hours apart from each other?

E
Earth revolves around the Sun once during that time.
E
Earth rotates entirely on its axis once during that time.
T
The moon revolves around Earth once during that time.
T
The moon’s orbit is in line with Earth’s orbit twice a day.
2
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Which period belongs to the Paleozoic era and not the Cenozoic era?

A
Devonian
B
Neogene
C
Paleogene
D
Quaternary
3

Which component does a descriptive investigation include?

A
observations
B
control group
C
comparisons
D
hypothesis
4

What term generally describes small chunks of rocks and debris in space?

A
meteorites
B
meteoroids
C
meteors
D
meteorides
5

The image shows locations of fossils from different geologic periods in Virginia.Which association correctly links the time period with the location of the fossils?

Question illustration
A
Pennsylvanian eastern and western Virginia
Option A
B
Cambrian throughout southern Virginia
Option B
C
Tertiary eastern Virginia
Option C
D
Quaternary eastern and western Virginia
Option D
6

Which planet is small, with a rocky surface and an atmosphere?

A
Jupiter
B
Neptune
C
Uranus
D
Venus
7

How long ago do scientists believe the continents formed Pangaea?

a
about 135 million years ago
a
about 180 million years ago
a
about 300 million years ago
a
about 4.5 billion years ago
8

In which direction does Earth rotate?

A
eastward around its axis
B
in an ellipse around the Sun
C
counterclockwise around the Sun
D
from north to south around its axis
9

Which characteristic do Mercury and Mars share?

A
many moons
B
rocky surfaces
C
thick atmospheres
D
moderate temperature fluctuations
10

Which statement accurately describes a half-life?

A
A rock’s size is determined by half-life.
A
All stable and unstable elements have a half-life.
A
An atom of an element becomes half its original size in a half-life.
A
A half-life is the time required for half of a radioactive element to decay.
11

Study this image.

Question illustration
A
Oceanic and continental plates are colliding.
B
Oceanic and continental plates are shifting past each other.
C
Two continental plates are forming a large mountain.
D
Two oceanic plates are creating several island chains.
12

Lori attended a lecture about the Sun, and the presenter had placed this image on the wall. Which layer of the Sun could this image be referring to?

Question illustration
A
the convection zone, because it shows how energy moves in a convection current
B
the radiation zone, because it shows how energy is transferred through radiation
C
the core, because it shows how the Sun creates energy through the process of nuclear fusion
D
the chromosphere, because it shows how energy is emitted by the atmosphere of the Sun
13

The line graph shows the depth of the Mississippi River from May 2007 through May 2015. It also shows the depth at which the river floods. These data were collected using a gauge that measures the height of the water, or water depth.

Question illustration
A
The recent reading was taken in the morning.
B
At the time of the recent reading, the Mississippi River was flooding.
C
At the time of the recent reading, the Mississippi River was at a low point.
D
At the time of the recent reading, the Mississippi River was as deep as it has ever been.
14

What are hypotheses partially based on?

A
conclusions
B
facts
C
observations
D
future events
15

The theory of plate tectonics states that the outer layer of Earth is divided into large, rigid blocks called plates. What could happen that may lead to a change in this theory?

A
Scientists discover new information about Earth's layers.
B
Scientists begin observing Earth's outer layer.
C
Scientists update their opinion of the theory.
D
Scientists revise the definition of theory so that it fits with what they believe.
16

Which statement best explains why Earth’s outer core is in liquid form?

A
The iron-nickel alloy melts due to hot temperatures.
B
The outer core has a tarry consistency.
C
This region is less dense when compared to the mantle.
D
This region is under extreme pressure from the weight of other layers.
17

The scatterplot shows an association between study time and quiz grades.

Question illustration
A
Students who do not study will get a quiz grade higher than 70%.
B
If students study for 20 minutes, they will get a quiz grade of 90% or higher.
C
Students who study for more than 30 minutes will get a quiz grade higher than 70%.
D
If students want a quiz grade of 90%, they should study at least 15 minutes.
18

The sudden eruptions of energy from a small area of the Sun’s surface are known as

A
solar flares.
B
sunspots.
C
prominences.
D
solar winds.
19

Which is the final event that occurs when a star is forming?

T
The outer layer of the star expands.
G
Gravity pulls gas and dust together.
A
A black hole forms as the core collapses.
N
Nuclear fusion begins under high pressure.
20

Which example is indirect evidence used to study Earth’s interior?

A
composition of minerals in a rock
B
age of a rock from within Earth
C
location of an earthquake’s epicenter
D
texture of different core samples

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