Climate Change

Choose the Correct Answer

Correct Answer : Option c

Explanation
Statement 1 is correct : Trees record Earth’s climate (hundreds or even thousands of years) in their rings. Three rings tell us how old the tree is and what the weather was like during each year of the tree’s life. One light ring plus one dark ring equals one year of the tree’s life. The light rings represent wood that grew in the early summer, while the dark rings represent wood that grew in the late summer. The colour and width of these rings can provide snapshots of past climate conditions. For example, tree rings usually grow wider during wet years, and they are thinner in dry years.

Statement 2 is correct: Ice cores (ice columns) are extracted by drilling deeply into glaciers and ice sheets. They hold a record of what our planet’s climate was like thousands of years ago. Ice sheets and glaciers near poles are formed from years and years of accumulating snowfall. Each layer of ice tells a story about what Earth was like when that layer of snow fell. The icy layers hold air molecules, GHGs and aerosols such as dust, ash, pollen, and sea salts of that time. These particles provide evidence of past global events, such as climate change, major volcanic eruptions, etc.