Question

scientists use proxy data to gather clues about climate history and predict future climate conditions. scientists weave this data together to determine past climates, called paleoclimates, and estimate current and future climatic changes. what sources of proxy data provide clues about earth’s past climates?
□ crustacean skeletons
□ ice cores
□ cloud formation
□ sediment layers
□ coral reefs
□ tree ring analysis

Explanation:

To determine the sources of proxy data for Earth’s past climates, we analyze each option:

• Crustacean skeletons: Chemical composition or isotopes in their skeletons can reflect past ocean conditions (temperature, salinity), so they are proxy data sources.
• Ice cores: Trapped air bubbles, isotopes, and impurities in ice cores provide info on past atmospheric composition, temperature, etc.
• Cloud formation: Clouds are part of current weather, not a long - term proxy for past climates as they don't preserve long - term climate - related info over geological time.
• Sediment layers: Sediments accumulate over time, and their composition, fossils, and layering can show past environmental (including climate) conditions.
• Coral reefs: Coral skeletons (like crustaceans) have isotopic and chemical signatures that record past ocean climate (temperature, nutrient levels).
• Tree ring analysis: Tree rings' width, density, etc., relate to past temperature, precipitation, and other climate factors during the tree's growth.

Answer:

A. crustacean skeletons, B. ice cores, D. sediment layers, E. coral reefs, F. tree ring analysis