Around 75% of ice has melted I think !
Answer:
The correct statement for comet is - ( a ) They have highly elliptical orbits around the sun
Explanation:
The comet is made up by the composition of dust , water , ice , rock and frozen gases like , the carbon dioxide , methane , ammonia and carbon monoxide .
Comet shows a process called outgassing , i.e. , the comet passes close to the sun , then they start to release gases , which is visible in the form of a comet's tail .
The comet and its tail glows by the sun and becomes visible when the comet passes through the solar system , because the dust partials reflects sunlight directly and the gas glows due to ionization process.
The orbital of comet is usually highly eccentric elliptical path .
Answer:
regular childhood vaccination
good sanitation
availability of medical care and treatment
Explanation:
The United States controls and prevents the spread of diseases in many ways. One of which is "regular childhood vaccination." This is considered to <em>be the most effective way. </em>There are about 10 vaccines that are recommended to kids.
The USA also follows<em> good sanitation</em> which includes<u> potable drinking water supply</u> available to most people and <u>having enough sewers were wastes are expelled.</u>
<em>Medical care and treatment in the USA is more advanced than other countries.</em> This is the reason why some people seek treatment in the USA when their disease is also more advanced and debilitating. <em>The USA has specialized facilities </em>catering to different kinds of diseases and their corresponding treatments.
A car was invented to run on only water and nothing else so that the air pollution can be decreased because then no smoke would come out of the exhaust.
