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Typically, hemipelagic sediment is transported to the continental slope in suspension from river mouths but can be transported by the wind. [3] The rate of deposition of hemipelagic sediment is higher than pelagic sediment but still quite slow. [9] Ordinarily hemipelagic sediments accumulate too rapidly to react chemically with seawater.
The climate and ecology of different locations on the globe naturally separate into life zones, depending on elevation, latitude, and location.The generally strong dependency on elevation is known as altitudinal zonation: the average temperature of a location decreases as the elevation increases.
The life zone concept was developed by C. Hart Merriam in 1889 as a means of describing areas with similar plant and animal communities. Merriam observed that the changes in these communities with an increase in latitude at a constant elevation are similar to the changes seen with an increase in elevation at a constant latitude.
The Holdridge life zones system is a global bioclimatic scheme for the classification of land areas. It was first published by Leslie Holdridge in 1947, and updated in 1967. It is a relatively simple system based on few empirical data, giving objective criteria. [ 1 ]
Climate charts provide an overview of the climate in a particular place. The letters in the top row stand for months: January, February, etc. The bars and numbers convey the following information: The blue bars represent the average amount of precipitation (rain, snow etc.) that falls in each month.
Some plants have a photoperiod (phototropism) requirement for a certain number of hours of daylight before they will grow, flower, or produce fruit. Without this, they will not complete their life cycle and will not produce fruit and seeds. So, seeds brought from the temperate zones may not perform as expected, or at all in the tropics.
Heating of solids, sunlight and shade in different altitudinal zones (Northern hemisphere) [5] A variety of environmental factors determines the boundaries of altitudinal zones found on mountains, ranging from direct effects of temperature and precipitation to indirect characteristics of the mountain itself, as well as biological interactions of the species.
The subtropical zones or subtropics are geographical and climate zones immediately to the north and south of the tropics. Geographically part of the temperate zones of both hemispheres, they cover the middle latitudes from 23°26′09.7″ (or 23.43602°) to approximately 35° to 40° north and south. [ 1 ]