The first one is radio-carbon dating.
The two types of radioactive dating that are most common are: Carbon 14 and Potassium-Argon. There are quite a few others.
The two different types of scientific method are discovery and hypothesis.
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When a controlled experiment is not possible or practical, two types of scientific investigations are observation and modeling.
mathematical model and physical model
quantitative and qualitative
Quantitative Research, and Qualitative Research. Those are the two!
Radiocarbon dating is a widely used scientific method for determining the age of organic artifacts. By measuring the decay of carbon isotopes in a sample, scientists can determine its age within a certain range. Other methods, such as tree-ring dating and thermoluminescence dating, are also used for dating different types of artifacts.
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The two methods are "RELATIVE DATING" and "ABSOLUTE DATING". :)
I think there are two. Covalent and Ionic. There might be more.
scientific journals and encyclopedia