Grade 9 / Science / Abeka / Chapter 8
66 Questions
| Attempts: 84
Science of the physical creation grade 9 chapter 8 practice test
Questions and Answers
- 1.
The study of the earth
- 2.
Earth's outer layer of rock; portion we are most familiar with
- 3.
The portion of the crust underlying the continents; a rock chiefly composed of silica and alumina
- 4.
The surest under the oceans; a denser rock that contains silica and significant amounts of magnesium
- 5.
Deposits of sand and mineral fragments
- 6.
The most abundant element in the earth's crust; makes up 50% of the earth's crust by weight
- 7.
Marks the lower boundary of the crust
- 8.
The middle layer of the earth
- 9.
Marks the lower boundary of the mantle and lies roughly 2900 km beneath the surface
- 10.
Central part of the earth
- 11.
"float" like rafts on the plastic rock of the upper mantle
- 12.
Slow convection currents in the plastic rock of the upper mantle
- 13.
One huge land mass
- 14.
When a layer of rock breaks under the strain of the forces upon it and moves
- 15.
Occurs when rocks along one side of a fault sink vertically
- 16.
Occurs when rocks along one side of a fault move horizontally along the fault
- 17.
Results when rocks on one side of a fault are thrust on top of the rocks on the other side
- 18.
Formed by the bending or buckling of rocks under great force
- 19.
Trough like structure
- 20.
An arch like structure
- 21.
Formed when molten rock erupts from a hole in the earth's crust
- 22.
Appear to be formed when molten rock is forced beneath an overflying rock layer, forcing the layer upward into a blister like dome
- 23.
Thought to have been formed when the edges of two adjacent rock layers were pushed violently together, causing the layers to buckle like a wrinkled rug
- 24.
Some of the most spectacular mountains in the world
- 25.
Any trembling or shaking of the earth's crust; sudden movement of rock masses along a fault
- 26.
Weak earthquakes
- 27.
Smaller earthquakes or tremors following an earthquake at frequent intervals for days or even months, gradually decreasing in intensity
- 28.
The study of earthquakes
- 29.
May involve either vertical or horizontal movement
- 30.
Rocks on either side of a fault spring back to a position of little or no stain an the moment an earthquake, triggering vibrations in the earth's crust
- 31.
Elastic strip along a strike-slip fault in western California
- 32.
The point at which an earthquake begins
- 33.
The point on the earth's surface directly above the focus of an earthquake
- 34.
Primary waves; consist of a rhythmic push-pull motion in the direction of wave travel such as when spiring is alternately pushed pulled along its length
- 35.
When P and S waves reach the earth's surface, they generate a third type of seismic wave called a __________
- 36.
Seismologists record and study the vibrations caused by earthquakes using an instrument called a ____________
- 37.
One of the most active zones; borders the Pacific Ocean and includes the great mountain chains of western North, Central, and South America, the islands of Japan, the philipines, New Zealand, and the islands in the South pacific
- 38.
There are twelve degrees of intensity as shown in the accompanying table
- 39.
The most famous scale used to measure earthquake strength
- 40.
The central feature of a volcano through which gases, has, and rock are ejected
- 41.
Molten rock that may lie 3-4 miles beneath the surface
- 42.
The study of volcano-related phenomena
- 43.
Volcanoes made of erupted volcanic ash and rock fragments
- 44.
Volcanoes which pour out large quantities of highly fluid lava in rather mild eruptions produce a broad, gently sloping volcano
- 45.
Produce symmetrical, wide based mountains that consist of alternating layers of lava and cinders
- 46.
If a volcano has erupted within the past 50 years
- 47.
A volcano which has erupted many years ago, but is now inactive
- 48.
A volcano which will probably not erupt again
- 49.
The most important belt; a narrow zone of active volcanoes that nearly encircles the Pacific Ocean Basin
- 50.
Any substance which is emitted by an active volcano
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