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Dissolved away over many hundreds/thousands of years like other features where the bedrock is limestone. There was probably a limestone cave beneath the sinkhole whose roof collapsed suddenly, the space had already been created. Mikenorton 22:35, 1 June 2010 (UTC)
Unprotected experiments in the U.S. in 1896 with an early X-ray tube (Crookes tube), when the dangers of radiation were largely unknown.[1]The history of radiation protection begins at the turn of the 19th and 20th centuries with the realization that ionizing radiation from natural and artificial sources can have harmful effects on living organisms.
After pollination, seeds of spring-flowering elms ripen and fall at the start of summer (June); they remain viable for only a few days. They are planted in sandy potting soil at a depth of 1 cm, and germinate in three weeks. Slow-germinating American elm will remain dormant until the second season. [12]
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The Florida peninsula is a porous plateau of karst limestone sitting atop bedrock, known as the Florida Platform. The largest deposits of potash in the United States are found in Florida. [133] The largest deposits of rock phosphate in the country are found in Florida. [133] Most of this is in Bone Valley. [134]
This is an accepted version of this page This is the latest accepted revision, reviewed on 31 January 2025. Scientific projections regarding the far future Several terms redirect here. For other uses, see List of numbers and List of years. Artist's concept of the Earth 5–7.5 billion years from now, when the Sun has become a red giant While the future cannot be predicted with certainty ...