The Rocky Mountains is famous in the world due to <u>wind energy resources, solar energy resources and geothermal energy resources</u>. In addition to that, there is availability of hydropower. However, <u>the current non-renewable energy resource is coal that generates electricity.</u>
The Great plains contain <u>three nonrenewable resources which include; rich oil ,coal and gas. </u>Due to its harsh climatic conditions, the plains experience a lot of droughts and high wind speed that can result to devastating dust storms. <u>The renewable energy resources in the Great plain area include Solar energy, and geothermal energy</u>
There are many ways to identify when a physical change has occurred. This can be done by recognizing reversible changes or eliminating chemical changes.
Physical changes involve state changes in matter and energy. These changes cause the matter to change form, but no new material is generated. Matter may alter in size, shape and color. When substances are combined but do not chemically react, physical changes take place.
A physical change can be recognized if it is reversible, especially if it involves a phase transition. For instance, if water is frozen into an ice cube, it can be melted back into water.
Sometimes eliminating the potential of a chemical transformation makes it easier to spot a physical change. There may be a number of signs that a chemical reaction has taken place.
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Full question: How to identify physical change?
Answer:
An analysis of 5,000-year-old genetic material from preserved human remains found in Sweden suggests that people moving from southern to northern Europe spread agriculture across that continent long ago.
In addition to agricultural know-how, the intrepid farmers brought their genes: They interbred with hunter-gatherer communities to create modern humans living in Europe today.
"Genetic variation of today's Europeans was strongly affected by immigrant Stone Age farmers, though a number of hunter-gatherer genes remain," study researcher Anders Götherström, of Uppsala University in Sweden, said in a statement.
The results of this study, to be published in the April 27 issue of the journal Science, match up well with previous archeological evidence of farming in Europe.
Explanation:
hope it help to you
<span>Planets
orbit in the same plane but not in the same direction.</span>
The orbits of all the planets in the solar system are coplanar. This is because
the planets are formed from a disk of dust that was found on the solar system
plane, and so all the planets are found on the same plane. However, six of the
planets orbit in the same direction with the exception of Uranus and Venus.
