Geography High School

John is assisting a geologist who has traveled across the world and collected a few samples. He asks John to classify the samples that can be dated using Carbon-14 and Uranium-235 (or U-235). All organic materials contain carbon and are dated using C-14; inorganic materials are dated using any radioactive element, such as uranium, rubidium, potassium, and thorium, except carbon. Now help John group the samples. Granite, wood piece, Egyptian mummies, Sand stone, gneisses

Answers

Answer 1

The samples can be grouped as follows: Organic materials that can be dated using Carbon-14 (C-14): Wood piece and Egyptian mummies. Inorganic materials that can be dated using radioactive elements other than carbon: Granite, sandstone, and gneisses.

Carbon-14 dating is used to determine the age of organic materials, such as wood, bones, and textiles. Since all organic materials contain carbon, they can be dated using the decay of the radioactive isotope Carbon-14.

On the other hand, inorganic materials like rocks and minerals cannot be dated using Carbon-14. Instead, they can be dated using other radioactive elements, such as uranium-235 (U-235), rubidium, potassium, and thorium. These elements undergo radioactive decay and can be used to estimate the age of inorganic materials.

Based on this information, the samples can be grouped as follows: The wood piece and Egyptian mummies are organic materials that can be dated using Carbon-14. The granite, sandstone, and gneisses are inorganic materials that can be dated using radioactive elements other than carbon. By classifying the samples based on their composition and the appropriate dating methods, the geologist can effectively analyze and determine the ages of the collected materials.

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