Be more specific, in order to answer this question.
Answer:
stratosphere
Most ozone (about 90%) is found in the stratosphere, which begins about 10–16 kilometers (6–10 miles) above Earth's surface and extends up to about 50 kilo- meters (31 miles) altitude. The stratospheric region with the highest ozone concentration is commonly known as the “ozone layer” (see Figure Q1-2).
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Since many countries<span> with </span>malaria<span> are </span>already among<span> the </span>poorer nations<span>, the </span>disease maintains<span> a</span>vicious cycle<span> of </span>disease<span> and </span>poverty <span> the least-developed </span>countries in<span> the world, with high infant mortality rates and low life expectancies. </span>True<span> or </span>False<span>? Sub-Saharan Africa is home to the poorest people of the world.</span>
Answer:
<em>A. 6,000 years</em>
Explanation:
Original sample N = 60 g
The half life of N/2 is 3000yrs
"""""""""""""""""""N/4 is 6000yrs
N/4 ===> 15 gram
it takes 6000yrs to decrease to 15grams
Local shear failure occurs when the shear stresses parallel to the grain, i.e. shear stresses acting in the longitudinal-tangential (LT) or longitudinal-radial (LR) planes, exceed the shear strength of the beam. The shear strength of a wood member is difficult to quantify.
