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A chemical reaction is at equilibrium when
The forward and reverse reactions proceed at the same rate
When there is a net release of energy in a chemical reaction, it is called a(n) _________ reaction
In order, from top to bottom, in the activity series come Li, K, Ba, Na, Al, Zn, Sn, and Pb. Therefore,
Tin is more active than lead
Compounds that have the same molecular formula but different structural formulas are called structural, or constituitional,
Other planetary systems are best detected by the Doppler shifts that change the pattern of the star's
Which of the following is a technique used by astronomers in their search for other planetary systems?
Both (A) and (B)
The Moon always presents the same face to Earth because
The Moon rotates on its axis at same rate at which it revolves around Earth
The apparent path that the Sun traces annually along the celestial sphere is known as the ____.
An incredible dense star so massive that light cannot ascape from it surface is called a ____.
Enormous filaments of excited gas arching over the Sun's surface and extending hundreds of thousand of kilometers outward are called
About 80% of the mass of the atmosphere and most of the clouds and water vapor are located in the
At 1800 degrees Fahrenheit, this part of atmosphere is heated almost directly by the Sun's rays
Doppler radar is replacing conventional radar in weather forecasting because
it can measure wind speeds
A class of pollutants formed at high temperatures (nearly complete combustion) in the presence of air is
Geologic evidence supports the theory of continental drift does not include
drag marks on the ocean floor
Alfred Wegener spectaculated that the present continents were once part of a single supercontinent that he named
The lithosphere "floats" on the asthenosphere, and the parts of lower density float higher. This state of buoyancy is called
The San Andreas fault in California is thought to be a boundary of two plates
that are sliding horizontally past one another
The difference in time between the arrival of S waves and the arrival of P waves can be used to determine
the epicenter of an earthquake
Large fractures in Earth's surface that are associated with the movement of lithospheric plates are called
Any natually occurring, inorganic, crystalline substance with a fairly definite chemical composition is called a(n)
The deflection of one lithospheric plate beneath another plate with which it is colliding is called
New rocks that have had their original form altered by heat and pressure, but without melting, are classified as
The process of leveling of the Earth by the wearing away of high places and the transportation to and deposition of sediments at lower levels is called
Small glaciers that form along mountains in hollow depressions that are protected from the Sun are called
The physical disintergration and chemical decomposition of rock at or near Earth's surface is called
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