If you could dig a tunnel right through the Earth you could theoretically free-fall to the centre of our planet in just eighteen minutes. You can’t, of course: such a tunnel would have to tolerate temperatures as high as the surface of the Sun and pressures three and a half million times greater than those at the Earth’s surface.
<span>Delta and American Airlines, for example, only allows children 15 and older to travel alone domestically without their unaccompanied minor service</span>
Answer:
5g will be left
Explanation:
Uranium 235 have a half-life of 700 million* years. This means that the element will decay to half its initial amount by that time. So if I start with 10g chunk of 235 Uranium, after 713 million years, only half of it (5g) will be remaining.
*the exact half life of Uranium 235 is 703,800,000 years.
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A) true. rural to urban migration is happening on a massive scale due to population pressure