Why do igneous rocks yield the most accurate radiometric ages, and what is the calculated date the
actual age of? What will be an ideal response?
As magma cools and begins to crystallize, radioactive parent atoms are separated from previously
formed daughter atoms. Some radioactive parent atoms are incorporated into the crystal structure of
certain minerals, but the stable daughter atoms are a different size and cannot fit into the crystal
structure of the same mineral as the parent atoms. Therefore, these minerals will contain radioactive
parent atoms but no stable daughter atoms. The time being measured is the time of crystallization of
the mineral that contains the radioactive atoms, which is the time when the magma was cooling.
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Indian pipe, a flowering plant, lacks chlorophyll and is not able to do photosynthesis. It obtains food as:
A. a mutualistic organism B. a host C. a commensal organism D. a parasite E. More than one of these choices is correct.
Which of the following sequences gives the correct order as we move from left to right across a row of the period table?
A) metal, metalloid, nonmetal B) metal, nonmetal, metalloid C) nonmetal, metal, metalloid D) nonmetal, metalloid, metal
Russia and Ukraine have a strained history involving tensions over the control of the Crimean Peninsula and Ukrainian independence. How did Josef Stalin's actions in the 1930s affect current relations?
High specific heat means that a substance is relatively resistant to changes in temperature
Indicate whether the statement is true or false