which radioactive isotope is used in geological dating?

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Answer 1

One of the radioactive isotopes commonly used in geological dating is carbon-14, also known as radiocarbon or C-14.

Carbon-14 is a radioactive isotope of carbon, with an atomic nucleus containing 6 protons and 8 neutrons.

Geological dating, specifically radiocarbon dating, is based on the principle that carbon-14 is constantly being formed in the Earth's atmosphere through cosmic ray interactions.

Living organisms, including plants and animals, absorb carbon-14 through photosynthesis or consumption. Upon death, the uptake of carbon-14 ceases, and the isotope begins to decay at a known rate.

By measuring the remaining amount of carbon-14 in organic materials, such as wood or bones, scientists can estimate the age of these materials and determine the time elapsed since the organism's death, providing valuable insights into geological timescales.

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Related Questions

examine the age structure of germany in the figure below. which of the following statementsis not supported by the age structure?a) there will be large positive population growth in the near future.b) there are more women than men between the ages of 60 and 70.c) there will be small negative population growth in the near future.d) there are more people between the ages of 25 to 39 then between 0 and 14.

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c) There will be small negative population growth in the near future.

Based on the age structure shown in the figure, it is evident that statement (c) is not supported. The age structure depicts a larger proportion of the population in the older age groups, particularly the 60 and above category. This indicates an aging population, which implies that the number of people reaching retirement age and beyond is increasing. In such a scenario, it is more likely to experience population decline or slow population growth rather than small negative population growth in the near future.

Statements (a), (b), and (d) are supported by the age structure. Statement (a) aligns with the higher proportion of younger individuals, indicating the potential for positive population growth as they reach reproductive age. Statement (b) is supported by the fact that there is a larger number of women compared to men in the 60-70 age group. Statement (d) is also supported as the age structure shows a larger number of people in the 25-39 age group compared to the 0-14 age group.

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Dwayne the rock johnson is descended from what pacific island nation?.

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Dwayne "The Rock" Johnson is is of Samoan descent through his mother's side of the family.

Samoans are Polynesians, and their culture and heritage have a significant influence on the islands of Samoa, which consist of two main parts: American Samoa and the Independent State of Samoa. Dwayne Johnson's maternal grandfather, Peter Maivia, was a professional wrestler himself and hails from Samoa.

Samoan culture is rich in traditions, including dance, music, tattoo artistry, and communal gatherings. Family is highly valued in Samoan society, and the concept of "aiga" (extended family) plays a central role in their way of life. Respect for elders, strong communal bonds, and a sense of pride in their heritage are important aspects of Samoan culture.

Dwayne Johnson frequently acknowledges his Samoan roots and proudly embraces his heritage. He has incorporated Samoan elements into his wrestling persona and has showcased Samoan culture in various aspects of his career, including his entrance rituals and tattoos. Furthermore, Johnson has actively promoted Samoan culture and has been involved in philanthropic efforts to support the Samoan community.

In summary, Dwayne "The Rock" Johnson is descended from the Pacific island nation of Samoa, which has played a significant role in shaping his identity and career.

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FILL IN THE BLANK.The vertical profile of ____ is variable in each layer of Earth's atmosphere.

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The vertical profile of temperature is variable in each layer of Earth's atmosphere.

The Earth's atmosphere is divided into distinct layers, each with its own characteristics and variations. The temperature profile within these layers can differ significantly, leading to variations in temperature with increasing altitude.

The layers of the Earth's atmosphere, from lowest to highest, are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. In general, the temperature decreases with increasing altitude in the troposphere, remains relatively stable in the stratosphere, decreases again in the mesosphere, and then increases significantly in the thermosphere due to the absorption of high-energy solar radiation.

However, it's important to note that the temperature profile within each layer can be influenced by various factors such as solar radiation, atmospheric composition, heat transfer mechanisms, and the presence of atmospheric phenomena like inversion layers or temperature inversions. These factors can introduce additional variability in the vertical temperature distribution within each layer.

Overall, the vertical profile of temperature in the Earth's atmosphere is not constant but exhibits variations in each layer.

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true/false. The process of undercutting
- Erosional action along shorelines occur at the base of the cliff at the waterline and below it.
- As rock is cracked and worn down by hydraulic action, this process of undercutting takes place.
- The wave is driven into the cliff, the force of the water then widens gaps in rock, and the rock ends up breaking away.

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Undercutting is a natural process of erosion where wave action, hydraulic action, and other erosional forces contribute to the weakening and eventual collapse of rock structures along shorelines. This statement is true.

The process of undercutting refers to erosion that occurs at the base of cliffs or shorelines, particularly at the waterline and below it. Waves play a crucial role in this process. As waves approach the shore, they carry sediment and exert hydraulic action on the cliff face. Hydraulic action involves the forceful impact of water against the rock, which can cause cracks and fractures to develop.

Over time, the repeated action of waves gradually widens these gaps in the rock, leading to the undermining or undercutting of the cliff. As the gaps enlarge, the structural integrity of the rock is compromised, and chunks of rock eventually break away from the cliff face and fall into the water.

This process is facilitated by other erosional agents, such as abrasion (where sediment carried by waves rubs against the cliff) and corrosion (chemical dissolution of rock by seawater).

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