Answer:
Yes Puerto Ricans are U.S citizens.
Explanation:
The Answer is True........................................................
The correct answer is C. Ozone
Explanation:
Ozone is a type of gas formed by oxygen that can be found mainly in the stratosphere that is the layer found from around 8km to 60 km above the Earth's surface. Additionally, the ozone is the gas that absorbs ultraviolet radiation produced by the sun, also called UV radiation, this function of ozone is quite important because an excess in UV radiation causes burns in the living organism and leads to dagame in tissues. However, an excess of ozone can also lead to the greenhouse effect. According to this, it is ozone the component or gas that absorbs damaging ultraviolet radiation from the sun.
More than 75 percent
Explanation:
Let us carefully analyze this problem:
The half life of the rubidium isotope = 50 billion years
The half-life of a radioactive isotope is the time it takes for it to decay to half of its original amount.
Every 50years, we know that a rubidium isotope would split into half.
Initially when the isotope was formed, we would only have the parent atoms there. There wont be any daughter;
ratio of parent to daughter = 100 : 0
When the isotope decays to half; we would have equal number of parent and daughter:
ratio of parent to daughter at half life = 50 : 50
The age of the earth is about 4.6billion years;
this is;
x 100 = 9.2% of the half-life of the rubidium isotope.
At this time, we should know that only 9.2 percent of the daughter would have been formed.
The remaining parent would be 100 - 9.2 = 90.8% would still be left undecayed.
The ratio of parent to daughter = 90.8 : 9.2
This is more than 75% of the parent
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