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Sounds travels fastest through
In order to use water on board ship for boilers, the water must first be
The most abundant metal in a free state in the Earth's crust is
An object will most effectively absorb the sun's rays if it is
polished, and dark in color.
rough, and light in color.
polished, and light in color.
rough, and dark in color.
The most effective farming method for returning minerals to the soil is
An example of a lever is
A lunar eclipse occurs when the
moon casts its shadow on the earth.
sun casts its shadow on the moon.
earth casts its shadow on the moon.
earth casts its shadow on the sun.
The part of the body that would suffer the most from a diet deficient in calcium is the
Which of the following is found in greatest quantities in automobile exhaust gases?
Which common electrical device contains an electric magnet?
In a vacuum, radio waves and visible light waves must have the same
The most accurate description of the earth's atmosphere is that it consists
mostly of oxygen, argon, carbon dioxide, and water vapor.
of gases which cannot be compressed.
of a mixture of gases, liquid droplets, and minute solid particles.
entirely of ozone, nitrogen, and water vapor.
Object A with a mass of 2 kilograms and object B with a mass of 4 kilograms are dropped simultaneously from rest near the surface of the earth. Neglecting air resistance, at the end of 3 seconds, what is the ratio of the speed of object A to the speed of object B?
In June, a weather station in a New England city reports a falling barometer and winds coming out of the southeast. The best weather forecast is probably
fair and colder.
rain and colder.
rain and warmer.
fair and warmer.
Which substance can be removed from water by filtration?
As a balloon rises, the gas within it
The best estimate of the age of the earth comes from the study of
the rate of erosion of the land.
the thickness of sedimentary rock.
the salt content of the oceans.
The presence of coal deposits in Alaska shows that, at one time, Alaska
was connected to Asia.
was connected to Europe.
had a tropical climate.
was covered with ice.
When an airplane is in flight, the air pressure on the top surface of the wing is
slightly more than on the bottom surface.
more or less than on the bottom surface, depending on the shape of the wing.
less than on the bottom surface.
the same as on the bottom surface.
In the human eye, which structure is like the film in a camera?
When water is taken apart by electricity, what two substances are formed?
oxygen and nitrogen
hydrogen and oxygen
carbon and oxygen
hydrogen and nitrogen
Compounds are created when
atoms of two or more different elements are combined.
atoms of two or more like elements are combined.
a molecule decomposes.
two or more molecules are combined.
The three elements found most commonly in commercial fertilizers are
phosphorous, nitrogen, sulfur.
calcium, phosphorous, iron.
magnesium, iron, calcium.
nitrogen, phosphorous, potassium.
Two non-porous rocks seem to lose the same weight when a string is attached to each and they are submerged in water. These two rocks must have the same
chemical and physical properties.
weight in air.
weight in water.
The thermos bottle is most similar in principle to
solar heating systems.
the freezing unit in an electric refrigerator.
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