Lakes - lentic ecosystems, Biology

Assignment Help:

Lakes - Lentic Ecosystems

Most lakes occur in regions which have recently been subjected to geological changes; say within the past 20,000 years. However, a few lakes, such as Lake Baikal in Russia and Lake Tanganyanitia in Africa are ancient and are estimated to have originated twenty million years ago. Lakes arise in several ways. Some, like the tectonic lakes, are formed in basins created by geological activities such as warping and faulting of the earth's crust. Most of the Himalayan lakes are tectonic in origin.

Some are formed in crater depressions of extinct volcanoes and are called crater lakes, for example lake Konsar nag in Kashmir. Others may be a result of glacial activity. For example most lakes of North America originated due to glacial erosions and deposition, whereby glacial abrasions of slopes in high mountain engraved basin which later became filled with melting snow and rain. Still others have been formed by deposition of silt, drift-wood and other debris in beds of slow moving streams. Lakes may also arise by landslides blocking off streams and valley.


Related Discussions:- Lakes - lentic ecosystems

Obelia, what are the economic importance of obelia?

what are the economic importance of obelia?

What will occur to the levels above of secondary consumers, In the short te...

In the short term what will occur to the levels above and below a population of secondary consumers of a numeric pyramid if a large number of individuals from this population dies?

How are antivenoms produced, How are antivenoms produced? Why are antivenom...

How are antivenoms produced? Why are antivenoms an example of passive immunization? Antivenoms are getting by the following process: the venom (antigen) is inoculated into othe

Sedge-meadow stage - hydrarch, Sedge-Meadow Stage - Hydrarch Favoured ...

Sedge-Meadow Stage - Hydrarch Favoured by an increasing amount of light, as the former occupants disappear, they gradually change the reed swamp into a sedge meadow. And now s

Male reproductive system - semen, SEMEN - Sperms and secretion of acces...

SEMEN - Sperms and secretion of accesory glands collectively known as seminal fluid or semen. It is milky, semi-solid in nature having particular smell. pH : 7.35 - 7.5. Spe

Blood, How the blood is circulated with the help of Heart?

How the blood is circulated with the help of Heart?

Which bone forms the non-moving muscle, Which bone forms the non-moving mus...

Which bone forms the non-moving muscle attachment in (a) the hip joint, (b) the shoulder joint, (c) the ankle joint?    (a) The pelvic girdle gives the non

The identity and amounts of elements in the molecule, If the chemical formu...

If the chemical formula of a substance is C17 H 31 COOH, what can you tell about the identity and amounts of elements in the molecule? Can someone please explain me this?

Describe nerve cells, In eukaryotes possibly the most rapid and complex sig...

In eukaryotes possibly the most rapid and complex signaling is mediated through nerve impulses.  The Nerve  cells  (neurons)  consist  of  a cell  body  with  numerous projections

Explain about the commercial sterility, Explain about the Commercial Steril...

Explain about the Commercial Sterility? It is important to remember that bacterial destruction is a logarithmic function, complete destruction not probable to make food commerc

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd