Describe the theory of continental drift
What will be an ideal response?
Answer: Continental drift proposed that continental land was not static—the continents moved. The theory was well supported by the jig-saw fit of continental land masses at their margins, and by data in paleo-climatology and paleontology. Although the evidence was quite remarkable, a suitable driving mechanism to produce such crustal movement was lacking.
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The Earth is about ___________ years old by ___________
a. 4 billion years old: radioactive dating b. 4 million; measuring Earth's orbital period around the Sun c. 4 billion; measuring Earth's orbital period around the Sun d. 4 million; radioactive dating
What is the surface temperature of a distant star (which emits light as if it were a blackbody) where the peak wavelength is 422 nm? (Hint: The surface of the human body at 35ºC has a peak wavelength of 9.41 ?m). (1 nm = 10?9 m = 10–3 ?m)
a. 12,900 K b. 13,800 K c. 6870 K d. 13,700 K e. 2290 K
What type of reaction gives CO2 and H2O as the only products?
a. Complete hydrocarbon combustion b. Acid–base reaction c. Acid–carbonate reaction d. Single-replacement, with an acid and an active metal
If I0 = 10-12 W/m2 is the threshold of hearing, a sound with intensity I1 = 10-10 W/m2 will give a certain decibel level. Suppose a new sound has an intensity I2 = I12/I0 . What is the new decibel level?
a. 40 c. 10,000 b. 20 d. It will square the decibel level.