Why does data from the ocean sediments show evidence for 20 or ...

[JMatthes]

Why does data from the ocean sediments show evidence for 20 or more glacial periods during the
  Pleistocene but the continental record only shows evidence for four? What will be an ideal response?

Question 2

The Pleistocene Epoch (10,000 to 1.6 million years ago) is the glacial age of the geological time scale.
  But is that the end of the story? What does the long-term pattern suggest in terms of the potential for
  future glaciation? What will be an ideal response?

[voltaire123]

Answer to Question 1

The data from ocean sediments is complete, but the data from the continents is incomplete because
evidence of glaciations on land is easily destroyed by later ice advances.

Answer to Question 2

ANS:The
Pleistocene Epoch included a series of major advances of glacial ice. These were separated by
warmer interglacial periods. The conditions that existed prior to previous glacial advances still exist.
The long-term pattern thus suggests that we are simply entering into yet another interglacial period.
The duration of previous interglacial periods was far longer than the anticipated duration of humanity's
access to fossil fuels. From this perspective, human-induced global warming will affect only the early
part of the current interglacial period. The long-term pattern would suggest other glacial advances yet
to come

[JMatthes]

Thank you

[voltaire123]

No problemo