You look at the organisms and compare them to the climates of where those organisms live today. Most often, this is done by analysis of pollen.
Answer:
The answer is Option B, 3 half-lives.
Explanation:
Potassium–argon dating (K–Ar dating) is a radiometric dating method. It measures the radioactive decay of an isotope of potassium (K) into argon (Ar). Potassium is a common element found in many materials like clay and certain minerals. The technique is best suited to dating minerals and rocks more than 100,000 years old. For shorter timescales, it is unlikely that enough argon (40 Ar) will have accumulated. This dating method is used by geologists and paleoanthropologists in order to understand very great expanses of time and the deposits that the earth has formed. One paleoanthropological example of how the technique has been used is in bracketing the age of deposits at Olduvai Gorge where hominin remains have been found. The scientists have dated lava flows above and below the deposits where fossils have been found. Other paleoanthropological discoveries have also been dated using this technique. It is well suited to sites that show evidence of volcanic activity, as in the case of East African sites like Hadar, Ethiopia.
You need to add x1 and x2 then divide by two, then add y1 and y2
Answer:
Earthquakes are caused by fault lines.
Explanation:
The continents are on massive tectonic plates the are constantly shifting because of the movement of magma underneath them. When the tectonic plates rub against each other, or collide with each other, it creates movement that we know as earthquakes. The reason why we feel earthquakes is because of the sudden energy release which causes seismic waves. One famous fault if the San Andreas fault, located in California. That is the reason why earthquakes are common in California (because it is located right next to a fault line).
