<span>A climate cycle in the Pacific Ocean with a global impact on weather patterns is called El Nino. The cycle begins when warm water in the western tropical Pacific Ocean and shifts eastward along the equator toward the coast of South America.
La Nina has cooler temperatures, not warmer ones. Temperature inversion is just a simple change of temperature. And global warming doesn't fit here as it is not a type of current.</span>
Answer:
D) Ozone
Explanation:
The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation.
It contains a high concentration of ozone in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere.
The Sun is lowest in the sky with less radiation in the Northern Hemisphere during the winter solstice.
Explanation:
The Earth is not static, but instead it is involved in several different motions. One of those motions is the Earth's tilt. Basically, the Earth is tilted with one of its hemispheres (northern or southern) toward the Sun in half of the year, and then in the other half of the year it is tilted with the other hemisphere toward the Sun.
When one of the hemispheres, lets say the Northern Hemisphere, is tilted away from the sky, and that reaches the maximum, it receives the least solar radiation, and the Sun is the lowest on the sky. That occurs on 21 or 22 December, and it is known as the winter solstice. This date represents the start of the winter for the Northern Hemisphere, thus its coldest period of the year.
The four stages on Earth caused by the tilting are:
- spring equinox
- summer solstice
- autumn equinox
- winter solstice
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The U.S. has more than 87,000 dams greater than six feet high (and two million overall). While many dams continue to provide benefits such as flood control, irrigation, and water supply, for other dams the cost of maintenance or the negative effects on communities, fish, and tribes justifies their removal.
Dam owners and regulators decide whether to remove a dam by weighing many factors including: the cost of removal and the ability to replace any lost power generation against avoided long-term maintenance; safety concerns; benefits to endangered fish populations; increased recreational and commercial fishing; and restoration of cultural values of nearby tribes.
By 2020, roughly 70% of dams will be more than 50 years old, inviting us to reconsider the value to the public of long-term investments in this infrastructure.
1. <span>China experiences </span>typhoons<span> every year and also suffers from floods, </span>tsunamis,earthquakes<span> and droughts.
2. </span><span>China is officially known as the People's Republic of China.
3. </span><span>China has the largest population in the world, with over 1.3 billion people (1,343,239,923) as of July 2012.
4. </span><span>There are many different languages spoken in China, including Mandarin, Yue, Wu, Minbei, Minnan, Xiang, Gan and Hakka.
5. </span><span>In 2003, China became the third country to successfully send a person to space.</span>
