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Types of Volcanoes

Geologists describe four types of volcanoes. Cinder cones, the simplest of volcanoes, grow as pieces of congealed lava rise from a central vent and form a funnel-shaped crater. Lava domes arise from lava too viscous to flow far or fast. The dome accumulates atop a central vent and expands from the inside. Shield volcanoes grow as fluid lava spreads ...

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TypesofVolcanoes
Geology

Water In The Ground

Some water underlies the Earth's surface almost everywhere, beneath hills, mountains, plains, and deserts. It is not always accessible, or fresh enough for use without treatment, and it's sometimes ... Continue reading

WaterInTheGround
Physics

Your Serve

NASA is well known for developing technology that makes things better, so can you believe that NASA actually did research on how to make tennis balls slower? ... Continue reading

YourServe
Geology

Pangea

From about 280-230 million years ago, (Late Paleozoic Era until the Late Triassic) the continent we now know as North America was continuous with Africa, South America, and Europe. Pangea first began ... Continue reading

Pangea
Chemistry

Carbon Dating

As isotopes break down, or decay they give off radiation. Materials that decompose in this way are said to have a 'half-life'. As the quantity of material present decreases, so does the actual rate at ... Continue reading

CarbonDating

Cloning and Ethics

CloningandEthicsCloning technology today is far from perfect: it requires many attempts and only 1%, if any, of the cloned eggs become embryos and then survive. For example, the first cloned sheep, Dolly, was successful after 277 attempts. That means that with the current technology, cloning a human being would require the death of many embryos - a moral issue not easy to deal with. Some say that embryos are not fully human, so there is no moral problem; others say it is obvious they are human, since all their genetic information is already present in the embryo.

The humanness of the embryo is not the only issue of debate in human cloning. Although there are good reasons to clone animals (for example, to preserve species and valuable genomes), are there any good reasons to clone a human? Defenders of human cloning say good reasons to clone a child would be to continue a family line when a couple is infertile (an adopted child would not carry their genes), to produce organs that are needed for transplants and trigger the development of new medical treatments. Critics of human cloning say it rises legal (if you have two humans with identical DNA, how do you determine guilt or innocence in criminal cases based on DNA evidence) and religious problems (cloning is considered by many religions as unnatural, evil, ‘not God’s way of reproduction’).

Bioethicists point out that the common fear about clones, that a clone of Hitler would be as bad as he was, is a myth without scientific basis, and we should weigh the risks of human cloning against its benefits. A good question is, if cloning becomes safe, should we do it?