South america has changed the least as it moved very little. india and australia actually broke apart from africa to go to where they are now... so id say australia and india changed the most
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:
<em>I can see that there are no choices.</em>
You can know the accuracy of the website by:
1. knowing who wrote the information and whether he/she provided a contact address or number.
2. the purpose of writing the information and whether the writer/author is qualified to write it.
Explanation:
The Internet is an<em> accessible and convenient tool for many people </em>when it comes to finding useful information. However, it becomes a problem when we talk about the credibility of information it provides. So, in order to assess whether the information is reliable, it is best to assess it by using five criteria: <em>Accuracy, Authority, Objectivity, Currency and Coverage. </em>
When it comes to "Accuracy," the information is most likely credible if<em> the name of the author/institution is listed there</em> and <em>it has a contact information</em>. In this way, you can verify it by calling or contacting the person. This will allow you to verify whether the author is, indeed, qualified to have written the information.
So, this explains the answer.
