The Rock Cycle
The Age of Rocks
Movement of Earth's Plates
The Geologic Time Scale

100

Which sentence about the rock cycle is true?
a. The rock cycle moves very quickly.
b. In the rock cycle, erosion builds new rock.
c. Rocks take a long time to move through the rock cycle.
c. Rocks take a long time to move through the rock cycle.

100

The position of rocks layers can be used to find
a. the absolute age of fossils.
b. the chemical composition of rocks.
c. the relative age of rocks.
c. the relative age of rocks.

100

Earth's plates
a. move quickly on Earth's surface
b. slowly change position over time
c. are always in the same place
b. slowly change position over time

100

Scientists estimate that Earth formed
a. 4,600 years ago
b. 4.6 million years ago
c. 4.6 billion years ago
b. 4.6 billion years ago

200

How are igneous rocks formed?
a. when molten material cools
b. when rock is changed by heat, pressure, or chemicals
c. when sediments are pressed together
a. when molten material cools

200

Scientists use radioactive dating to find.
a. the absolute age of fossils
b. the relative age of rocks
c. trace fossils in igneous rock
a. the absolute age of fossils

200

Which of the following natural events occurs during the longest period of time?
a. tsunami
b. lightning strike
c. plate movement
d. volcanic eruption
c. plate movement

200

The geologic time scale begins with
a. Precambrian Time.
b. the Paleozoic Era.
c. the Mesozoic Era.
a. Precambrian Time

300

Magma that pushes its way into rocks and hardens is called a(an)
a. extrusion
b. fault
c. intrusion
c. intrusion

300

The law of superposition states that, in horizontal layers of sedimentary rock, each layer is
a. younger than the layer above it and older that the layer below it.
b. neither older nor younger that the other layers.
c. older than the layer above it and younger than the layer below it.
d. always older than any vertical layers.
c. older than the layer above it and younger than the layer below it.

300

A species of grass is adapted to a wet climate. If the climate becomes drier, what will most likely happen to the grass?
a. it will become a new species
b. it will become extinct
c. it will grow in a new location
d. it will produce more offspring
b. it will become extinct

300

In the Cambrian Explosion,
a. an asteroid hit Earth.
b. many different organisms evolved.
c. Earth formed.
b. many different organisms evolved.

400

Which of the following is NOT a process in the rock cycle?
a. melting
b. weathering
c. continental drift
d. volcanic activity
c. continental drift

400

What allows geologists to determine the absolute age of a rock sample?
a. index fossils
b. radioactive dating
c. the law of superposition
d. the presence of bacteria
b. radioactive dating

400

Which of the following is LEAST likely to cause widespread change in the climate on Earth?
a. an earthquake
b. a volcanic eruption
c. an asteroid impact
d. an ice age
a. an earthquake

400

The Mesozoic Era is often called the
a. Age of Mammals.
b. Age of Fish.
c. Age of Reptiles.
c. Age of Reptiles

500

Which is the correct order of the processes that form rock from sediment?
a. deposition, cementation, compaction, erosion
b. erosion, cementation, deposition, compaction
c. cementation, compaction, deposition, erosion
d. erosion, deposition, compaction, cementation
d. erosion, deposition, compaction, cementation

500

The fossil record shows that fossils occur in a particular order. What does this order tell us about life on Earth?
a. life forms have changed over time.
b. life forms have become more simple over time.
c. life forms have become less diverse over time.
d. life forms represented by fossils are now extinct.
a. life forms have changed over time.

500

Almost all species of marsupials live in Australia. Which statement about marsupials can be supported using the theory of continental drift?
a. Australia has the best climate from marsupials.
b. Marsupials are uniquely adapted to Australia.
c. Australia must have separated from the other continents about the time that marsupials evolved.
d. Marsupials must have evolved after Australia separated from the other continents.
c. Australia must have separated from the other continents about the time that marsupials evolved.

500

Approximately when did life begin on Earth?
a. more than 3 billion years ago
b. about 1 billion years ago
c. about 245 million years ago
d. about 1.8 million years ago
a. more than 3 billion years ago