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A climate record—extending deep into the Earth's past—has been assembled, and continues to be built up, based on geological evidence from borehole temperature profiles, cores removed from deep accumulations of ice, floral and faunal records, glacial and periglacial processes, stable-isotope and other analyses of sediment layers, and records of past sea levels.More recent data are provided by the instrumental record. Jim O’Connor,will present “Before the Dams: the Geology of the Columbia River Gorge” for a special Father’s Day event on Sunday, June 18th at the Columbia Gorge Discovery Center.Jim will be part of a day focusing on the culture …

The bulk of the volcano is formed by lava flows of andesitic and dacitic composition.Climate change may refer to a change in average weather conditions, or in the time variation of weather around longer-term average conditions (i.e., more or fewer extreme weather events).Climate change is caused by factors such as biotic processes, variations in solar radiation received by Earth, plate tectonics, and volcanic eruptions.Modern science accepts that the Earth is about 4.54 billion years old and the entire universe is around 13.77 billion years old.These limits usually take the form: "Because we observe [X], which occurs at rate [Y], the universe must be at least [Z] years old".

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