Answer:
The isotope you would use to date a fossil from paleozioc era is the 47 billion years half-life 87rb as the paleozoic era dates from 540 to 248 million years ago.
Explanation:
Sometimes geologists need to estimate older fossils, like the ones from the paleozoic era which is the oldest of the three eras.
Carbon-14, the radioactive isotope of carbon used in carbon dating has a half-life of 5730 years, so it decays too fast and it is useful to date fossils younger than about 75,000 years.
To date most older fossils and to estimate how long ago rocks formed, geologists use unstable radioactive isotopes of elements, decaying at constant, and this is called radiometric dating, rocksadiometric dating or radioisotope-dating of igneous rocks or ash located above, below or around the fossil vecinity.
Answer:
there were several important cities that came into being as centers of trade and religion, such as Mecca, Medina (Yathrib), Karbala, and Damascus.
Explanation:
Answer:
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Explanation:
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Precambrian rocks<span> are mostly covered by rock systems of more recent origin, but where visible they commonly display evidence of having been altered by intense </span>metamorphism<span>. Precambrian rocks often occur in shields, which are large areas of relatively low elevation that form parts of continental masses.</span>
Answer:
The increased flooding may occur due to climate change, deforestation, or erosion.
Climate change may have made the climate of the city wetter, leading to higher river flows that naturally cause more flooding.
Deforestation is also a common cause of higher flooding. Trees serve almost as anchors on the land, and keep the land from overflooding.
Land erosion, due to the river itself, or to agriculture, can also made the soil more prone to flooding.