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» Browse Science and Environment Term Papers
Aluminium
Number of Words: 493 / Number of Pages: 2
... mica cemented together with felspar. These rocks are gradually
weathered and broken down by the action of carbon-dioxide from the air dissolved
in rainwater forming ‘kaolin'. This is further broken down to form other
substances, ultimately resulting in the formation of Aluminium deposits.
Where and how Aluminium is mined?
Aluminium is never found in it's pure state until it has been refined. Aluminium
is made when refining alumina, which is in turn found from the ore ‘bauxite'.
Bauxite is often mined in the opencast method.
Aluminium deposits are found in many countries, but the countries with
sig ...
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Atomic Theory
Number of Words: 531 / Number of Pages: 2
... It is relativly
easy to measure the weights of liquids and sloids, the same procedure for
gas is followed, more or less. In the early 1960s, though, the
international union of chemistry and physics agreed that there would be a
new standard, carbon isotope (carbon-12).
British physicist Ernest Rutherford found and proved that an atom's
mass is concentrated in its its nucleus, which is the center of the atom.
He also gave the idea that parts of an atom, called its electrons, orbit
the nucleus. He said that the electrons were "negatively charged" and that
the protons were "positively charged". He said ...
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Mars 4
Number of Words: 500 / Number of Pages: 2
... fine, dust-sized particles than they do the dark reigons. The mineral scapolite,which is rare on Earth,seem's wide spread; it may serve as a store for carbon dioxide in the atmosphere.
Bright caps, apparntly made of frost or ice, mark the planet's polar regions . their seasonal cycle has been followed for almost two centuries .Each Martian autumn, bright clouds form over correct pole.Bellow what is called polar hood , a thin cap of carbon dioxide frost is let during autumn and winter.By late winter, the cap may streach down to latitudes of 45 degrees. At about spring, and the end of the long polar nig ...
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Chromosome Probes At The University Of Toronto
Number of Words: 726 / Number of Pages: 3
... probes would be much simpler and faster to
perform and could be available to all pregnant women who wish to take
advantage of the technology.
Current prenatal testing involves growing fetal cells in vitro and
examining them, over one or two months, to see if there are two copies of a
particular chromosome, which is normal, or one or three, which is abnormal.
A test using Willard's probes would require only a few cells and a few days
to detect abnormalities. "I don't think it's beyond the realm of
possibility that these kinds of tests could eventually be done by an
obstetrician in the office duri ...
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Reforestation
Number of Words: 795 / Number of Pages: 3
... overlooked from all of this.
The older, larger trees can store much, much more carbon dioxide than a new tree
could. By cutting and burning these magnificent seasoned trees, the CO2 is
being released back into the atmosphere. These releases of carbon dioxide add
up in our surroundings, only to intensify Global Warming. Although this shows
what happens when one burns and cuts down old forests, one must still plant new
trees for long term plans, not letting them grow for a few years, to then cut
them down.
There are many methods for planning a forest. The simplest method of replanting
a forest ...
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Ecology Assignment
Number of Words: 1414 / Number of Pages: 6
... Scientist barely ever count the amount of individuals in a certain area because it would take too much time. Instead of actually counting the number of individuals in an area they would compare it with other areas where they know the population of individuals. In this way they can roughly estimate the number of individuals in a certain area.
4. What might happen to a rabbit population in an area where there are no predators?
If there were a few rabbits in an area with no predators they would over-populate and cause serious damage to the ground. Since they are fast at reproducing there is nothi ...
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Deep Ocean Trenches
Number of Words: 926 / Number of Pages: 4
... distorted into folded masses and molded into new material of the continents.
Deep trench in the sea bed indicating the presence of a destructive margin (produced by the movements of plate tectonics). The dragging downwards of one plate of the lithosphere beneath another means that the ocean floor is pulled down. Ocean trenches are found around the edge of the Pacific Ocean and the northeastern Indian Ocean; minor ones occur in the Caribbean and near the Falkland Islands.
Ocean trenches represent the deepest parts of the ocean floor, the deepest being the Mariana Trench which has a depth of
11,034 m/ ...
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Solving The Mystery Of The Romanovs
Number of Words: 476 / Number of Pages: 2
... passed on from the egg. This means that the mitochondria DNA is
passed on from the mother. This information becomes useful when using them
for identification purposes.
In any given cell, there are thousands of copies of mitochondrial
DNA. This relative abundance of mitochondrial DNA can be used by
scientists to obtain DNA from samples where genomic DNA analysis is
difficult of impossible. The first question was which, if any, of the
bones found belonged to the Czar. To answer this, mitochondrial DNA was
obtained eight adult male femur bones found in the grave. Then using a
program called Clustal ...
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Greenhouse Effect
Number of Words: 967 / Number of Pages: 4
... yet too much can lead to serious threats. The problem lies in the disruption of the balance between how much carbon dioxide plants intake, and what our population produces. If this natural filtering process is unbalanced, the atmosphere will receive too much carbon dioxide and other greenhouse gases. Once these gases form in the atmosphere, they act as barriers trapping in heat and warming the earth. This process is not new. In fact, without the , the average surface temperature of the earth would be about 59 Fahrenheit degrees lower than it is today. "Long before civilization intervened , the thin b ...
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The Beginning Of The Universe
Number of Words: 1280 / Number of Pages: 5
... no beginning in the past, nor will there be change in the future. This model assumes the perfect cosmological principle. This principle says that the universe is the same everywhere on the large scale, at all times.2 It maintains the same average density of matter forever.
There are observational evidences found that can prove the Big Bang model is more reasonable than the Steady State model. First, the redshifts of distant galaxies. Redshift is a Doppler effect which states that if a galaxy is moving away, the spectral line of that galaxy observed will have a shift to the red end. The faster the ...
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