Nitrogen (N), nonmetallic element of Group 15 [Va] of the periodic table. It is a colourless, odourless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter. Boiling point: −195.8 °C (−320.4 °F)
Atomic number: 7 has five electrons in its outer shell, so it is trivalent in most compounds. Nitrogen is important for plant growth and can be 'fixed' by lightning or added to soils in fertilisers. A colourless, odourless gas. Nitrogen is important to the chemical industry. It is used to make fertilisers, nitric acid, nylon, dyes and explosives.
Answer:
Mars
Explanation:
At present there are around 540 extrasolar known planets. These are distant planets so not a lot is known about them, but there are some basic things that provide some basic information about them. It seems that the majority of them are planets that resemble Jupiter, being large and gaseous planets. It is very rare that a planet resembles Mars, in fact it is the rarest type of planets among the known planets so far. Even the planets that do share some characteristics with Mars, they also have characteristics that make them different, especially their size and distance from their star. Mars type of planets are very rare because of what Mars have actually become. The planet is assumed to have been similar to Earth, but its core has stopped its activity, resulting in no magnetism, and no volcanic activity. Also, the atmosphere of this planet is very thin, the temperatures vary greatly throughout the day, and its surface is covered with thick layers of dust and craters.
Water pollution which is a major problem in urban areas have some of the causes such as dumping refuse to the water bodies, discharging of industrial wastes to the water bodies and it is a major problem to the people who rely on this water supply because they can contact disease from the water when they drink it.
<h3 /><h3>What is water pollution?</h3>
Water pollution can be described as the act of dropping any substance that can contaminate the natural state of water into the water bodies.
It should be noted that this one of the problem in the urban cities and this as a result of the discharging of waste from the industries.
Read more about Water pollution at:
brainly.com/question/1235358
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The correct answer is A. Heliocentric theory
Explanation:
Galileo Galilei was an Italian astronomer, mainly known for his observations that led Galilei to conclude planets revolve around the Sun (Heliocentric theory) instead of the sun and other planets revolving around the Earth (Geogcentrict theory). One of the observations that make Galilei drew this conclusion were telescopic observation of Venus, in this Galieli noticed similar to the moon Venus had different "phases" or changed its size and lighting, which was only possible if the sun was in the center of the solar system and planets revolve around it including the Earth. Thus, that Galileo was Venus changing size proved the Heliocentric theory.
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