<span>The Greenhouse Effect:
The greenhouse effect is a natural phenomenon, which, helps maintain the
relatively stable, livable, range of temperatures that we find on
earth. To better understand how this phenomenon works, scientists have
used the analogy of the greenhouse. In a greenhouse, the glass (the
atmosphere) allows the radiant energy (light) of the sun to enter. As
the radiant energy strikes various plants, gases, and objects in the
greenhouse, they heat up. Their heat is then released back into the air
of the greenhouse as infrared radiation (heat). This infrared radiation
cannot travel through the glass and remains inside the greenhouse,
increasing the temperature inside the greenhouse. Temperatures can be
controlled, or kept in balance, by allowing some of the heat to remain
inside and some to be vented to the outside. Under normal conditions,
the earth's atmosphere works in a similar manner. Solar radiation enters
the atmosphere and heats up the air molecules, the surface of the
earth, buildings, plants, and other objects. These objects in turn,
radiate infrared radiation back out into the atmosphere, where some of
this radiation is absorbed by the greenhouse gases, and some is radiated
out into space. As some of the heat stays in the atmosphere and some
escapes into spaces, a balance is maintained allowing our planet to have
a relatively stable range of temperatures. Scientists believe that as
the greenhouse gases become more abundant in the atmosphere, due mainly
to the burning of fossil fuels, they retain more and more infrared
radiation, allowing less and less to escape into space, tipping the
balance toward heating up the atmosphere, resulting in a changing and
warmer climate, planet-wide. This is the accelerated greenhouse effect.
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Answer:
<u>diode</u>: It passes current only in one direction.
<u>resistor</u>: Is the most commonly used electronic element. It is used to limit the electric current flowing in the electronic system.
<u>transistor</u>: It strengthens the current in the receivers, it can also turn it on and off. This element has three tips, which we call the base, collector and emitter.
<u>capacitor</u> : Has the ability to store electricity and can release it when needed. Next to the resistor, it belongs to the most commonly used elements in electronic devices.
Explanation:
Diode is a substance which is half conductor and half insulator that is used to compel the current to flow in only one direction. Resistor is a device which is used for controlling flow of current through circuit. Capacitor is a device which is used as a storage device which provides extra electricity to machine when it is required. Transistor is a device which is used to amplify or switch electronic signals and electrical power.
Answer:
Location C of the moon will give the impression of a waning crescent.
Explanation:
Hope this helps
Because of Dhaka's position below sea level the city experiences yearly flooding, particularly around the monsoon seasons and has the constant threat of rising sea levels, which would of course cause more flooding.
The correct answer is - b. Steady surface temperature increases were noted between the 1970's and 90's.
Once it has been noticed that the global temperature is actually rising instead of dropping, the scientists shifted their opinion and focused on a global warming instead of the global cooling.
The temperature rise was noticed in most of the world with few exceptions, but the most concerning was the warming on the north and south pole because of the melting of the polar caps the sea levels will rise globally and this will contribute to lots of big problems apart from the global rise of the temperature (though on short term), and that lots of huge important cities may end up bellow water and that the world economy will collapse.