The elements listed in the choices are radioactive materials. These materials are very unstable because of the high neutron-to-proton ratio in the nucleus. Because of this, they spontaneously undergo nuclear reactions by giving off sub-particles in order to lower the ratio. They emit radiation in the form of alpha, beta or gamma.
Half-life is the length of time it needs to completely react half of the original amount. For example, it would take Bismuth 60.5 seconds to use up half of its amount. Therefore, the lower the half-life the faster the reaction is and the lesser the residual amount will be. With that being said, the answer would be Bismuth because it only takes seconds.
The correct answer is B. Less arable land.
Arable land is the main reason why the land is cleared. Arable land is the land that is suitable for ploughing and of sufficient quality for growing plants. So for this reason, the forests are cleared (by cutting the trees and bushes) and more land for agriculture is gained.
Answer:
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I think the correct answer among the choices listed above is option C. Drinking water from your kitchen faucet is the <span>event that would most likely result in arsenic poisoning in the United States today. This is because water pipelines today has the possibility to have traces of arsenic and also some water sources are contaminated</span>
Answer:
Plate Tectonic theory
Explanation:
Plate tectonics is based on continental drift, and seafloor spreading the three pieces of evidence that support this are those given by Alfred Wagner
As the Jigsaw fit between continents that were one at some point in time.
As the polar wandering or the flight to poles i.e how continents are drifted way to poles by forces of wind.
Presence of the same flora and fauna and glacial valley formation that were once a part of the same continent of Pangea and Gondwana.
The hypothesis ultimately got replaced by seafloor spreading as the drawbacks of drift theory which would not give sufficient evidence for the spreading away of continents. Earth's tectonic forces and internal sources of energy i.e heat produced by radioactive decay was not emphasized and Alfred's continuous orogeny could not have been possible.
