Two students design an experiment to see if pushing or pulling a box across the floor is more effective. the first student pushes the box across the floor a distance of 20 feet and the second student times how long it takes. next they switch roles and the second student pulls the same box across the floor instead of pushing. they repeat this 5 times. which statement best describes the design of this experiment? a) this is a well design experiment. b) this experiment is not well design because 20 feet is too long a distance. c) this experiment is not well design because they should not repeat it 5 times. d) this experiment is not well design because they should not switch roles during the experiment.

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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.

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.

its temperature is increasing. this causes molecular vibrations to increase.