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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globalization has led to an improvement in standard of living through improved roads and transportation, improved health care, and improved education due to the global expansion of corporations.
Answer:
The intermediate to felsic eruptions may be usually moderately to highly explosive
Explanation:
- Felsic lavas are hot, high in silica and volatiles, and have a high viscosity of fluid matter. They are thick and heavy and resistance movements.
- They thus represent the shielded nature of volcanoes etc. Fluid lava flow, tephra, lapilli, and volcanic bombs.
- Felsic magma is rich in feldspar, and silica as opposed to mafic magma which is rich in magnesium and iron.
- Felsic magma is usually acidic.
- As a result of the high intensity of volcanic eruptions, the lava is sticky and dark in color also it's bulky, etc. An example of Mount Saint Helens that erupted destroying both property and human life.
The Similarity between the ecosystem approach , ecosystem based management ,and ecosystem management is that they both protect and mange the environment as well as the earth and its species from potential harm.
<h3>What is
ecosystem management ?</h3>
The ecosystem management can be described as the approaches that could be the one that is simply considering the impact of a management decision as regards the elements of the ecosystem which help in the simultaneous optimization of management strategies.
This is been done to meet management goals of all elements of an ecosystem, hence The Similarity between the ecosystem approach , ecosystem based management ,and ecosystem management is that they both protect and mange the environment as well as the earth and its species from potential harm.
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