Lakes - lentic ecosystems, Biology

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.

Posted Date: 1/19/2013 4:24:16 AM | Location : United States







Related Discussions:- Lakes - lentic ecosystems, Assignment Help, Ask Question on Lakes - lentic ecosystems, Get Answer, Expert's Help, Lakes - lentic ecosystems Discussions

Write discussion on Lakes - lentic ecosystems
Your posts are moderated
Related Questions
What is the endocrine function of the placenta? The placenta is not a permanent gland of the endocrine system but it also has endocrinal function. The placenta produces estroge

Respiratory Organs These are the organs regarded with the gaseous exchange, i.e., intake .of oxygen and output of carbon dioxide. They have generally greater rate of gas exch

Angiotensin Converting Enzyme Inhibitors (ACEI) has shown to reduce mortality in heart failure to the tune of 16-30 per cent in various large trials. The renin-angiotensin-aldos

Explain Management strategies for genetically modified crops? Crops that have been genetically modified (GM) to be toxic to insect pests are now common in US agriculture. Make

3 main stages of bone formation, and explain the process of these 3 stages.

What are the gibberellins? And where are they produced? The Gibberellins are plant hormones that stimulate plant growth, fruit formation (also parthenocarpy) and the germinatio

What are the Technique of Operation in CPS? Percutaneous balloon valvotomy is the procedure of choice at any age. If this is not feasible, open surgical valvotomy is recommende

Development of Endosperm In a fertilized embryo sac, the primary endosperm nucleus is generally observed below the zygote. It divides, and further divisions of its products gi

What are taenias? What are the diseases caused by them? Taenias, also called as tapeworms, are platyhelminth animals (flatworms). The major diseases caused by taenias are taeni

the mass number is used to calculate the number of _________in one atom of an elemement. In order to calculate the number of neutrons you must subtract the _______from the ______.