8th Grade Science Unit 2 SLO Review- 2016-2017 Question Preview (ID: 34705)


Rocks, Plate Tectonics, Fossils, Adaptations. TEACHERS: click here for quick copy question ID numbers.

How do fossils found in sedimentary rock layers help scientists?
a) They explain why volcanoes exist.
b) They explain why rocks are formed.
c) They explain how igneous rocks are made.
d) They explain how species change over time.

What can be used as evidence that living things have evolved over the years?
a) Particles in the air
b) Fossil records
c) Tree rings from cut trees
d) Chemicals in human hair

What is the best example that there was a Pangea?
a) Madagascar and India have similar shapes.
b) Bedrock in Australia and Greenland has glacier scratches
c) North America and India have matching mountain chains.
d) Matching rock layers can be found in South America and Africa.

Why do some extrusive igneous rocks form pores(holes)?
a) It's when the rock heats up then cools down quickly.
b) It's when pressure squeezes sediment out.
c) It's when gases escape the liquid rock while the rock is forming.
d) It's from minerals forming as the rock cools.

A geologist working in the mountains found many marine fossils. What conclusion can he make about the mountain area?
a) It was flooded by heavy rains.
b) It was once a volcano.
c) It was once part of a grassland.
d) It was once covered by an ocean

Characteristics of metamorphic rocks are
a) those that are made up of 2 minerals of different colors.
b) those that don't have a regular shape
c) those that have wavy bands of other rocks or minerals
d) those that have fossils in them.

Rocks that have shells cemented into them are classified as
a) volcanic
b) sedimentary
c) igneous
d) metamorphic

What is true about chemical weathering?
a) Chemical weathering breaks rocks into smaller pieces
b) Chemical weathering changes the composition of rocks.
c) Chemical weathering only affects igneous rocks
d) Chemical weathering only affects metamorphic rocks.

Chemical and physical weathering both cause changes to earth's surface. Which of the following would physical weathering occur more quickly?
a) large boulders found in areas with heavy air pollution.
b) iron-rich rocks found in valleys
c) limestone rocks found in isolated areas
d) cracked boulders found on cold mountain peaks.

Present-day organisms often evolve from a common ancestor. Why do they have different characteristics than their ancestors?
a) Extinction
b) Respiration
c) Asexual reproduction
d) Adaptations

There are differences of the teeth and hooves of present day horses compared to horse fossils in the past. What is true about the horse fossil record?
a) The horse has been a carnivore.
b) The horse has changed over time
c) The horse has many common ancestors
d) The horse has lived in the same ecosystem.

A fossil of a species found in one rock layer is the same species as a fossil found in another layer. However their structures are slightly different. Why?
a) this species changed over time
b) this species had many predators
c) the life span of this species changed
d) the food supply of this species changed

A marine fossil was found in the mountains on one continent and in the mountains on another continent. What does that tell scientists?
a) glaciers carried the fossils up the mountains
b) the mountains were both volcanic
c) clams once lived in mountains, but have since evolved into sea-dwelling creatures
d) the rock layers that the fossils were found are from the same geologic age

Scientists learn a lot by studying the earth's rock layers. Why do we study rock layers?
a) to find rock fragments
b) to find new species of organisms
c) to find evidence of the core of earth
d) to find physical evidence of the history of earth

This type of rock is known to contain small pieces of rock or fossils cemented together.
a) Igneous
b) Magma
c) Metamorphic
d) Sedimentary

The earth's surface has changed over time and continues to change. What evidence have we learned that proves this?
a) Some rock layers are very thick
b) Some species have become extinct
c) Marine fossils are found in mountain areas
d) Igneous rock is found on all tectonic plates

What causes the crustal plates to move?
a) Earth's magnetic field
b) Offshore drilling for oil
c) Rising global temperatures
d) Convection currents in the mantle.

What best describes the earth's crust?
a) iron-based rocks
b) separate moving plates
c) thickest under the ocean floor
d) Composed mainly of molten rock

What occurs along plate boundaries?
a) Erosion and deposition
b) Hurricanes and tornadoes
c) Earthquakes and volcanoes
d) Tidal waves and sedimentation

What is true about the law of superposition?
a) The youngest rock layer is on the bottom.
b) An intrusion is the oldest.
c) A fault is the oldest.
d) The oldest rock layer is on the bottom.

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