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Chemistry

2 answers:

emmasim [6.3K]3 years ago

7 0

Answer:

Tectonic plates glide over the surface of Earth's mantle, and therefore changing the location of land over time. The fossils in the picture were originally together as the same area. However, over time, Earth's plates shifted over the mantle to separate these into two locations.

Serjik [45]3 years ago

5 0

Answer:They aren’t found in Africa

Explanation:

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A radioactive isotope of potassium (k) has a half-life of 20 minutes. if a 43 gram sample of this isotope is allowed to decay fo

Ksenya-84 [330]

Hello!

The half-life is the time of half-disintegration, it is the time in which half of the atoms of an isotope disintegrate.

We have the following data:

mo (initial mass) = 43 g

m (final mass after time T) = ? (in g)

x (number of periods elapsed) = ?

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T (Elapsed time for sample reduction) = 80 minutes