A radioactive element with a half-life of 1,000 years, and starting mass of 20 grams, will need 2,000 years to decrease to 5 grams.
Explanation:
The radioactive elements all have a specific half-life. Each element's half-life is well known, and they are used by scientists of numerous fields as they are excellent for determining the age of a particular item, be it or organic or non-organic nature. In this case, we have a radioactive element with a half-life of 1,000 years, and starting mass of 20 grams.
The half-life basically means that half of the mass of an element is lost during a particular period of time. For the element in question we need to find out how much time will be needed for it to decrease to 5 grams. In order to get to the result, we just need to add 1,000 years on every decrease of half of the mass:
20/2 = 10
10/2 = 5
So in 1,000 years, the element in question will decrease to 10 grams, and in further 1,000 years (2,000 cumulatively) it will decrease to 5 grams.
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Answer:
The Tropics receive more direct sunlight, resulting in warmer climates. The Poles receive almost no direct sunlight, resulting in a colder climate.
Explanation:
The tropics and the poles are two totally different regions on Earth. The differences can be seen in pretty much everything, from climate conditions to soil, geography, biosphere, precipitation, human activity, etc. One of the most noticeable and most important differences between the two is definitely the angle at which the sunlight falls.
The tropics are the region that receives sunlight at direct or close to direct angle all year round. This means highly concentrated sunlight and warm or hot weather conditions all year round. The poles are the region that receives sunlight at the lowest angle, having it constantly for around half a year, and then lacking it for half a year. This means very dispersed sunlight which can not warm up the surface and air, so the weather conditions are very cold all year round.
Exploit is usually means a way considered which "unfair"
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