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Which sources do scientists use to study ancient climates? Check all that apply.
Earth’s orbit
tree rings
volcanoes
pollen grains
fossils
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Check: tree rings, pollen grains, fossils.
- Tree rings (dendrochronology) record annual growth changes tied to climate.
- Pollen grains (palynology) show past vegetation communities and therefore climate.
- Fossils (especially plant and marine fossils) indicate past temperatures and environments.
Earth’s orbit and volcanoes are important influences on climate (and orbital cycles are used in models), but they are not direct proxy "sources" of past climate information like the others.
- Tree rings (dendrochronology) record annual growth changes tied to climate.
- Pollen grains (palynology) show past vegetation communities and therefore climate.
- Fossils (especially plant and marine fossils) indicate past temperatures and environments.
Earth’s orbit and volcanoes are important influences on climate (and orbital cycles are used in models), but they are not direct proxy "sources" of past climate information like the others.
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