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A felled tree allows direct sunlight to reach the forest floor. The creation of a treefall gap causes a break in the canopy to form, allowing light to penetrate through to the understory . This light can now reach shrubs and treelet species, which under normal circumstances never grow tall enough to reach the canopy. [ 7 ]
I scanned the trees and saw that a maple tree had "exploded". The explosion caused a big crack in the tree about three feet high. When a winter wind stirs the frozen trees, they sometimes appear to burst vertically. When it was 40 degrees below zero at night, I lay awake and listened to the trees explode. That's a true wilderness thermometer!
This is a list of places on land below mean sea level. Places artificially created such as tunnels, mines, basements, and dug holes, or places under water, or existing temporarily as a result of ebbing of sea tide etc., are not included. Places where seawater and rainwater is pumped away are included.
[1]: 51 The tree line is sometimes distinguished from a lower timberline, which is the line below which trees form a forest with a closed canopy. [2]: 151 [3]: 18 At the tree line, tree growth is often sparse, stunted, and deformed by wind and cold. This is sometimes known as krummholz (German for "crooked wood"). [4]: 58
The frost line—also known as frost depth or freezing depth—is most commonly the depth to which the groundwater in soil is expected to freeze. The frost depth depends on the climatic conditions of an area, the heat transfer properties of the soil and adjacent materials, and on nearby heat sources.
Below-freezing overnight temperatures are expected to continue from Sunday through Friday, says the agency. Dangerous cold for millions. Arctic air spreads across much of the US this week, and for ...
Freezing [1] or frost occurs when the air temperature falls below the freezing point of water (0 °C, 32 °F, 273 K). This is usually measured at the height of 1.2 metres above the ground surface. This is usually measured at the height of 1.2 metres above the ground surface.
Farther to the east, in cities such as New Orleans; Mobile, Alabama; and Pensacola, Florida, the thaw and freeze cycles and risk of icy surfaces during the nighttime and morning hours may last ...