Briefly explain how magnetic reversals in oceanic crust and fossils in ocean sediments are used to
construct a magnetic time scale. What will be an ideal response?
A terrestrial sequence of magnetic reversal in volcanic deposits was dated radiometrically. These dates
were extrapolated to regions which were not dated, but showed the same pattern of normal and
reversed magnetic polarities. Ages of ocean-floor basalts lying within a zone of normal or reversed
polarity are dated by the ages of the fossils found in the sediments that directly overlie the basaltic
crust. These fossils have already been incorporated within a biostratigraphic zone.
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In which state has the feasibility of a high level nuclear waste repository been investigated at a cost of 10 billion dollars?
What will be an ideal response?
Most countries adopt a selective immigration policy that excludes unwanted migrants and includes more desired ones
Indicate whether the statement is true or false.
Describe and discuss the lifestyle of Cro-Magnons. What will be an ideal response?
A wide diversity of living things provide a range of intrinsic benefits to humans.
Answer the following statement true (T) or false (F)