To observe how plants compete for space, seeds were tested in an experiment. The same amount of soil was put into each of five plastic cups. Two seeds were planted in the first cup, 4 seeds were planted in the second cup, 8 seeds in the third cup, and 16 seeds were planted in the fourth cup. Only one seed was planted in the last cup to compare with the other pots. After 25 days, the height of the plants was measured to determine which plants grew best. what is the control?

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explanation:

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.

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explanation:

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you should wear a lead protective shield when having teeth x-rays

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-lavira : )