An atom has a atomic number 17 and atomic mass number 35. how many neutrons are present in its nucleus

Your atomic number is also your number of protons (which is typically the same number of electrons as well, unless otherwise stated). Your atomic mass is your number of protons and neutrons. In order to find your neutrons, just subtract the mass number from the atomic number!  

35 - 17 = 18 neutrons!

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plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

preservation because he preserves part of the land and preserves means save

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