In an unweathered sample of detrital sedimentary rock, the ratio of an unstable isotope to its stable daughter isotope is 1/15. If no daughters were present at the time the rock cooled below closure temperature, and the half-life of the reaction is 50 million years, how old is the rock?

a. 200 million years
b. 400 million years
c. 750 million years
d. None of the above are correct

How would i answer this in a exam. orange - sea temperature is over 27 red arrows - tropical storm routes

Which of the following is defined as combinations of soil particles that vary in size and shape?

[fw.02]diana is studying four surface features of florida. she classifies the surface features and places them in different columns of a chart as shown below. surface features column 1 column 2 hot springs sinkholes caverns geysers which of these titles best represents column 1 of diana's chart? formed by freezing groundwater o formed by heating groundwater o formed by evaporation of groundwater o formed by chemical action of groundwater