In the 19th century the famous physicist Lord Kelvin estimated the age of Earth to be much much less than its present estimate. What information did Kelvin not have to account for his error?
A) Lord Kelvin knew only classical physics and had no knowledge of anthropological dating.
B) Lord Kelvin had no knowledge of radio waves for measuring distance and age of planets since they have not yet been introduced into science.
C) Lord Kelvin was not aware of radioactive decay, a source of energy to keep Earth warm for billions of years.
D) Lord Kelvin never gave any estimate of the age of Earth.
C
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A city park and a freshwater lake are examples of ____________________ that are vulnerable to non-native species and pollution.
Fill in the blank(s) with the appropriate word(s).
The maximum daily temperature usually occurs: a. a few hours after the time of maximum solar heating
b. at the time of maximum solar heating. c. a few hours before the time of maximum solar heating. d. when clouds begin to form.
A state which places most power in the hands of a central government is a(n)
A) federal state. B) anocratic state. C) fragmented state. D) unitary state. E) compact state.
Biome composed of a coniferous and deciduous trees with a short summer.
A. pelagic B. pioneer community C. marsh D. euphotic E. boreal forest F. deciduous forest G. grassland H. desert I. tundra J. biochemical oxygen demand K. phytoplankton L. savanna M. littoral zone N. benthic O. periphyton