The correct answer is pretest and posttest .
A pretest/posttest experiment is an experiment that includes double measurements at multiple points in time. In this kind of test, measurements (measurement of dependent variable) are taken both before and after a treatment.
The process is called the WaterCycle
You have to employ deductive reasoning to answer this question.
Do sea walls protect land from erosion?
Do limits on clear cutting protect land from erosion?
Do cut and burn methods conserve land by enriching the soil?
How would rain water harvesting contribute to the conservation of land?
<span><span>Clouds of gas form within galaxies.
</span><span>Formation of structure within the gas clouds, due to "turbulence" and activity of new stars.
</span><span>Random turbulent processes lead to regions dense enough to collapse under their own weight, in spite of a hostile environment.
</span><span>As blob collapses, a disk forms, with growing "protostar" at the center.
</span><span>At the same time, bipolar outflows from forming star/disk system begin.
</span><span>Material is processed, moving in from the blob to the disk. What is not lost in the outflow builds up on the protostar.
</span><span>When the protostar begins to undergo fusion, it becomes a real star.
</span><span>Once the outflow ceases and the "accretion" phase that lead to the buildup of the star ends, a disk of "leftover" material is left around the star.
</span><span>At or near the end of the star-formation process, the remaining material in the "circumstellar disk" (a.k.a. "protoplanetary disk") forms a variety of planets.
</span><span>Eventually, all that is left behind is a new star, perhaps some planets, and a disk of left-over ground-up solids, visible as a "Debris Disk"around stars other than the Sun, and known as the "Zodaical Dust Disk" around the Sun.</span></span>
Correct answer: A). Plates
The tectonic plates are the pieces of earth's crust and mantle, which is together referred to as the lithosphere. The lithosphere is a rigid outermost layer of the planet that is broken down into the tectonic plates.
The plates move because the earth's lithosphere has a higher strength than the asthenosphere. During an earthquake, the plates move over each other.
Hence, the correct answer would be option A.
