EVERYDAY SCIENCE

Detailed explanation-1: -The correct answer for the question that is being presented above is this one: “a. ice cores.” Clues to what ancient climates were like come from all of the following except ice cores. Others like very old weather records is not also an acceptable clue that what is like ancient climates.

Detailed explanation-2: -Clues about the past climate are buried in sediments at the bottom of the oceans and lakes, locked away in coral reefs, frozen in glaciers and ice caps, and preserved in the rings of treesTo extend those records, paleoclimatologists look for clues in Earth’s natural environmental records.

Detailed explanation-3: -Answer and Explanation: Evidence about ancient climates indicates that atmospheric carbon dioxide levels were once about 5 times their present levels.

Detailed explanation-4: -The climate of ancient Earth is called its paleoclimate, and scientists study it to understand how Earth’s climate might change in the future. In Figure 1, you can see how, in the past, Earth’s climate was either much warmer or much colder than it is today.

Detailed explanation-5: -When scientists focus on climate from before the past 100-150 years, they use records from physical, chemical, and biological materials preserved within the geologic record. Organisms (such as diatoms, forams, and coral) can serve as useful climate proxies.