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

Why the enzymatic action is highly specific, Why can it be said that the en...

Why can it be said that the enzymatic action is highly specific? The enzymatic action is highly specific because only exact substrates of one enzyme bind to the activation cent

Adaptive mechanisms, The adaptive mechanisms may be short term ones which c...

The adaptive mechanisms may be short term ones which come into play within minutes or hours of the onset of myocardial dysfunction. These are: Frank-Starling Mechanism In

Explain the types of photoelectric cells, Question 1. State the basic p...

Question 1. State the basic properties of light. Discuss the special features of ultra-microscopy and phase contrast microscopy 2. What are ultrasonic waves? Explain the dif

Placenta - human development, Placenta - Human Development We had said...

Placenta - Human Development We had said previous in the unit that in the second week of development a primitive uteroplacental circulation is established. Early in this stage

Technique of operation, Technique of Operation :  TEE probe i...

Technique of Operation :  TEE probe is passed in all cases soon after anaesthesia. The initial steps and exposure of mitral valve are done as for open mitral valvotom

Metabolism of proteins, The major component of food is protein. The protein...

The major component of food is protein. The proteins ingested as part of our diet are not the same proteins required by the body, nor can large molecules be absorbed from the gut.

What in genetics is hybridization, What in Genetics is hybridization? T...

What in Genetics is hybridization? The Hybridization in Genetics is the crossing of individuals from "pure" and different lineages in relation to a given trait that is the cros

Parturition , P ARTURITIO N - Gestation period is of 280 days (in rab...

P ARTURITIO N - Gestation period is of 280 days (in rabbit 28 days). Parturition is the expelling of fully mature young ones from the mother's uterus. Oxytocin stimulates

Why immune response involves the activities of proteins, The immune respons...

The immune response involves the activities of proteins, cells, and the lymphatic system.

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