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Questions asked by the same visitor
What is climate
Updated 5/4/2012 3:07:35 AM
1 Answer/Comment
Climate encompasses the statistics of temperature, humidity, atmospheric pressure, wind, precipitation, atmospheric particle count and other meteorological elemental measurements in a given region over long periods. Climate can be contrasted to weather, which is the present condition of these elements and their variations over shorter periods.

Added 5/4/2012 3:07:35 AM
what are the importance of volcanic rock to man
Updated 6/17/2012 3:19:29 AM
1 Answer/Comment
Volcanic rocks are geologically important because:

1. their minerals and global chemistry give information about the composition of the mantle, from which some igneous rocks are extracted, and the temperature and pressure conditions that allowed this extraction, and/or of other pre-existing rock that melted;

2. their absolute ages can be obtained from various forms of radiometric dating and thus can be compared to adjacent geological strata, allowing a time sequence of events;

3. their features are usually characteristic of a specific tectonic environment, allowing tectonic reconstitutions (see plate tectonics);

4. in some special circumstances they host important mineral deposits (ores): for example, tungsten, tin, and uranium are commonly associated with granites and diorites, whereas ores of chromium and platinum are commonly associated with gabbros.
Added 6/17/2012 3:19:29 AM
Rated good by amis66
What is the economic inportant of rivers in africa
Updated 5/4/2012 7:03:38 AM
1 Answer/Comment
The Niger has served as a focal point for the development of African civilizations, particularly the ancient kingdoms of Ghana and Mali. It continues to play a key role in the region, serving as a source of livelihood for many West African farmers, fishers, and herders, as a transportation route in areas that are otherwise poorly connected, and as a source of energy.

Added 5/4/2012 7:03:38 AM
What is evolution?
Weegy: Evolution is any change across successive generations in the heritable characteristics of biological populations. [ Evolutionary processes give rise to diversity at every level of biological organisation, including species, individual organisms and molecules such as DNA and proteins.[1] Life on Earth originated and then evolved from a universal common ancestor approximately 3.7 billion years ago. Repeated speciation and the divergence of life can be inferred from shared sets of biochemical and morphological traits, or by shared DNA sequences. These homologous traits and sequences are more similar among species that share a more recent common ancestor, and can be used to reconstruct evolutionary histories, using both existing species and the fossil record. Existing patterns of biodiversity have been shaped both by speciation and by extinction.[2] Charles Darwin was the first to formulate a scientific argument for the theory of evolution by means of natural selection. Evolution by natural selection is a process that is inferred from three facts about populations: 1) more offspring are produced than can possibly survive, 2) traits vary among individuals, leading to differential rates of survival and reproduction, and 3) trait differences are heritable.[3] Thus, when members of a population die they are replaced by the progeny of parents that were better adapted to survive and reproduce in the environment in which natural selection took place. This process creates and preserves traits that are seemingly fitted for the functional roles they perform.[4] Natural selection is the only known cause of adaptation, but not the only known cause of evolution. Other, nonadaptive causes of evolution include mutation and genetic drift.[5] In the early 20th century, genetics was integrated with Darwin's theory of evolution by natural selection through the discipline of population genetics. The importance of natural selection as a cause of evolution was accepted into other ... (More)
Expert Answered
Asked 5/4/2012 6:43:04 AM
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How do i check my email
Weegy: Just enter your username/emaid add and password to the website. (More)
Expert Answered
Asked 5/4/2012 8:21:42 AM
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