Proxy data:
A) come quality- controlled instrument records.
B) can only extend the temperature record back an additional 500 years.
C) provide climate data representing times when instruments were not available to measure them.
D) are difficult to find because they occur only in very limited areas.

Question

Quizplus · Accepted Answer

Proxy data are collected from natural sources such as tree rings, ice cores, and sediment layers, providing a record of past climate conditions, often going back thousands of years before the invention of modern instruments. Therefore, proxy data can provide climate data representing times when instruments were not available to measure them.

Proxy Data