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3 days ago · How Stalagmites and Stalactites Form. Speleothems form through the deposition of minerals from water. It all starts with water making its way through rocks in the ground. Trickling water picks up carbon dioxide from air, forming carbonic acid and making the water acidic. The acidic water dissolves minerals in rocks.
3 days ago · fossil, remnant, impression, or trace of an animal or plant of a past geologic age that has been preserved in Earth’s crust.
- The Editors of Encyclopaedia Britannica
1 day ago · The definition is not based on percentage of canopy cover and does not discriminate between primary- and secondary-growth tropical forest because there are no Landsat data available prior to 1982.
3 days ago · A peak or projection from the top of a hill or mountain, or any rounded protrusion of land, especially a small but prominent or isolated hill with steep sides; a boulder or an area of resistant rock protruding from the side of a hill or mountain. The term is used primarily in the southern United States. [5] knoll.
1 day ago · Biology is the scientific study of life. [1] [2] [3] It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field. [1] [2] [3] For instance, all organisms are made up of cells that process hereditary information encoded in genes , which can be transmitted to future generations.
1 day ago · The Concepts that Made Prehistory: An Interview with Stefanos Geroulanos. by Benjamin Diehl. Stefanos Geroulanos is the Director of the Remarque Institute and Professor of History at New York University. At the center of Geroulanos’s work has been an interest in how the concept of the human has been made and remade in the past few centuries.
5 days ago · N. nadir. narrows. Also narrow. A land or water passage that is confined or restricted by its narrow breadth, often a strait or a water gap. nation. A stable community of people formed on the basis of a common geographic territory, language, economy, ethnicity, or psychological make-up as manifested in a common culture. national mapping agency.
