Comprehension quiz

Ice Cores and Ancient Climate Records

Listen to the lesson carefully, then answer 10 comprehension questions. Pick one option per question.

Question 1What is the main purpose of the lecture?

To explain how scientists reconstruct past climates from ice cores To argue that ice cores only record past temperatures To describe how drilling equipment is designed for polar regions To compare modern and ancient greenhouse gas production

Question 2Where was the first drilling project finally carried out?

In Greenland, as originally proposed In the Arctic, near the North Pole In Antarctica, after the plan changed In northern Canada, near Greenland

Question 3What surprised scientists most about past climate change?

The speed at which the change occurred The fact that warming happened at all The slow cooling of the oceans The size of the trapped air bubbles

Question 4What do the air bubbles trapped in each layer of ice preserve?

The temperature of the drilling equipment The atmosphere of that particular era The minerals from ancient volcanic eruptions The remains of early sea creatures

Question 5How far back can researchers measure carbon dioxide levels using these bubbles?

Only the last fifty years Hundreds of thousands of years About two thousand years Exactly one million years

Question 6What did later evidence reveal about how the oceans cooled?

It occurred at a steady and slow rate It involved several abrupt shifts It never actually took place It matched earlier studies exactly

Question 7Which ratio do scientists measure within each frozen layer of ice?

The ratio of oxygen isotopes The ratio of carbon to nitrogen The ratio of ice to trapped air The ratio of salt to fresh water

Question 8Which idea is closest in meaning to calling ice cores essentially time capsules?

They must be opened within a fixed period They were buried deliberately for future study They store a detailed record of past climate They protect instruments from extreme cold

Question 9What was the original plan for the first drilling project?

To drill in Antarctica from the very start To analyse the bubbles in a laboratory first To measure oxygen isotopes in Arctic rivers To carry out the drilling in Greenland

Question 10Why does the speaker mention the last major ice age?

As a warning about rising future sea levels As proof that funding shapes research As the earliest drilled ice core sample As a concrete example for the audience