Answer: Options (1), (3), (4), (6) and (9)
Explanation: Hot-spots are the region of active volcanisms and this could be due to the presence of large mantle plumes, plate tectonic movement, as well as other reasons.
Hot-spots are generated in the following tectonically active boundaries such as-
- Convergence of two oceanic plates.
- Convergence of an oceanic and continental plate.
- Divergence of two oceanic plates.
- Hotspots within the oceanic and continental plate.
There are changes in temperature daily. An impact of South Indian high pressure cell and south Atlantic high pressure cell on movement of cyclones will lead to a lowering of warming air and dry conditions for almost all year round.
<h3>What is the impact of South Indian high pressure cell?</h3>
The South Atlantic, South Indian and Kalahari anticyclones are known to influence the climate of South Africa all year round
They tend to decrease the descending movement of warming air and dry conditions all year round and they also take place sue to the positions that they occupy is always changing.
This makes us to have changing seasonal climate and changing weather conditions all year round.
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Answer:
Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Portugal, Slovakia, Slovenia and Spain
Explanation:
-- so that other scientists can reproduce your experiment in their labs
-- so that when you go back and read your own experiment next year,
you'll be able to remember and understand what you did
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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