Relative dating planets

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Seasonal changes in temperature, although large in a particular place, correspond to very tiny changes in global mean temperature. Earth exchanges energy with its environment primarily through transfers of electromagnetic radiation.At any time our planet is simultaneously absorbing energy from the sun and radiating energy back into space.

Seasonal changes in temperature, although large in a particular place, correspond to very tiny changes in global mean temperature. Earth exchanges energy with its environment primarily through transfers of electromagnetic radiation.At any time our planet is simultaneously absorbing energy from the sun and radiating energy back into space.The fraction of incoming solar radiation that is reflected back to space constitutes Earth's albedo, as shown below in Figure 3.

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Figure 8.8 The great angular unconformity in the Grand Canyon, Arizona.[SE] The principle of cross-cutting relationships states that any geological feature that cuts across, or disrupts another feature must be younger than the feature that is disrupted.An example of this is given in Figure 8.7, which shows three different sedimentary layers.For example, the principle of superposition states that sedimentary layers are deposited in sequence, and, unless the entire sequence has been turned over by tectonic processes or disrupted by faulting, the layers at the bottom are older than those at the top.The principle of inclusions states that any rock fragments that are included in rock must be older than the rock in which they are included.The lower sandstone layer is disrupted by two faults, so we can infer that the faults are younger than that layer.But the faults do not appear to continue into the coal seam, and they certainly do not continue into the upper sandstone.Earth's surface temperature has been remarkably constant over geologic time.Even the dramatic cooling that occurred during the most recent ice age represented a change of only 3°C in the global average surface temperature, occurring over thousands of years.The lava flow took place some time after the diorite cooled, was uplifted, and then eroded.(Hammerhead for scale) [SE] Figure 8.6b Rip-up clasts of shale embedded in Gabriola Formation sandstone, Gabriola Island, B. The pieces of shale were eroded as the sandstone was deposited, so the shale is older than the sandstone.

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