4.1 evidence for Climate Change

When did the Quaternary period start?

• 2.6 million years ago

• 10,000 years ago

• 5.5 million years ago

• I don't know yet

What does the oxygen isotope analysis in sediments and ice cores indicate?

• Age of fossils

• Changes in atmospheric temperatures

• Sea level rise

• I don't know yet

Which period shows the most significant increase in global temperatures according to Figure 1?

• Before 1900

• Mid-1970s onwards

• Just after 2000

• I don't know yet

What is a direct result of thermal expansion due to global warming?

• Lowering of sea levels

• Rising sea levels

• More glacial formation

• I don't know yet

How has global warming affected bird migration?

• Birds are migrating later than usual

• Migration patterns remain unchanged

• Birds are migrating earlier than in the 1970s

• I don't know yet

What is a projection made about glaciers due to climate change?

• They will all melt by 2035

• Some may disappear by 2035

• They will grow larger by 2035

• I don't know yet

What has happened to the extent of the Arctic sea ice since 1979?

• It has remained the same

• It has expanded

• It reached an all-time low

• I don't know yet

What is the significance of oxygen isotope analysis?

• It determines the saltiness of the ocean

• It indicates the age of ocean sediments

• It helps calculate past temperature changes

• I don't know yet

What can be inferred about climate change from fossil records?

• Fossils can only show the types of species that existed

• Fossils indicate a gradual cooling trend over 5.5 million years

• Fossil records show temperatures over time

• I don't know yet

Which statement is true?

• Global temperatures have been consistently falling since 1880

• There is no clear trend in global temperatures

• Global temperatures show a clear warming trend, particularly since the mid-1970s

• I don't know yet