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A submerged forest is the in situ remains of trees, especially tree stumps, that lie submerged beneath a bay, sea, ocean, lake, or other body of water. These remains have usually been buried in mud, peat, or sand for several thousand years before being uncovered by sea level change and erosion and have been preserved in the compacted sediment ...
Level IV ecoregions (denoted by numbers and letters) are a further subdivision of Level III ecoregions (denoted by numbers alone). [ 2 ] [ 3 ] In general, Illinois transitions from the forests, to savannah , to tall grass prairie , and is now largely used for agriculture or urbanized, although in its far south are the forested highlands of the ...
The soil of Sand Ridge State Forest is 89% sand, 8% clay, and 3% silt. [5] There are two types of sand, red and yellow. [6] Dunes and swales were created after sand was deposited, but before vegetation could grow, during what is called the Parkland Formation. [1] [2] Dunes range from 6 m (20 ft) up to 30 m (98 ft). [1]
Map of wood-filled areas in the United States, circa 2000 [1]. In the United States, the forest cover by state and territory is estimated from tree-attributes using the basic statistics reported by the Forest Inventory and Analysis (FIA) program of the Forest Service. [2]
The Illinois List of Endangered and Threatened Species is reviewed about every five years by the Illinois Endangered Species Protection Board (ESPB). [1] To date it has evaluated only plants and animals of the US state of Illinois, not fungi, algae, or other forms of life; species that occur in Illinois which are listed as endangered or threatened by the U.S. federal government under the ...
Temperatures in Illinois are projected to rise over the course of the 21st century. The amount of increase depends on how much humans curtail their CO 2 emissions. If humans continue to emit at current levels, the increase will be between 8 and 14 °F (4.4 and 7.8 °C). If emissions are lowered, the rise will be between 4 and 9 °F (2.2 and 5 °C).
Most of the sand and gravel of the Mahomet Aquifer is from the lower half of the Banner Formation and belongs to the Mahomet Sand Member which is buried 100 to 200 feet (30 to 61 m) below the ground surface. The aquifer underlies 1,260,000 acres (510,000 hectares) of land in east-central Illinois and spans 15 counties (Panno and Korab, 2000).
Wind throw is the toppling of a tree due to the force of the wind, this exposes the root plate and adjacent soil beneath the tree and influences slope stability. Wind throw is a factor when considering one tree on a slope; however, it is of lesser importance when considering general slope stability for a body of trees as the wind forces involved represent a smaller percentage of the potential ...