All carbon atoms have six (6 ) protons but the number of neutrons can be six (6 ), seven (7 ), or eight (8 ). Different neutron numbers ____
A)force the atom to bond with elements that it normally would not
B)change the atom's atomic mass number and make it an isotope
C)cause the atom to be more or less reactive
D)change the atom's atomic mass number and make it an ion
E)cause the atom to be unstable
B
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Which of the following is not true of the Intergovernmental Panel on Climate Change (IPCC)?
A) In its 2007 assessment, the IPCC identified a number of ways in which climate is changing. B) The IPCC's assessment included statements reflecting the confidence of the participating scientists that the current climate changes began in the twentieth century. C) The IPCC stated that warming is caused at least in part by humans. D) The IPCC stated that warming will occur in the twenty-first century. E) The IPCC stated that changes in human behavior will not reduce warming in the future.
A hanging valley forms from the eroded valley of a tributary valley glacier that met the trunk valley
glacier at an elevation high above the valley floor of the latter. What will be an ideal response?
Rates of primary productivity in the open ocean are about the same as ________.
A. intensive agriculture regions B. deserts and grasslands C. rainforests D. pastures
An asymmetrical, streamlined hill made of glacial till is called a:
What will be an ideal response?