The graph below shows the half life values of parent isotopes. Based on the graph, it can be concluded that the isotope which is most likely to be found with 12.5% of its original amount in 42 billion years is (2 points)

A soil sample is 35 percent sand, 10 percent clay, and 55 percent silt. Use the following soil texture triangle to determine the type of soil present in this sample. (2 points) Public Domain

The star named Polaris has a declination of approximately +90°. In what direction is Polaris located from the celestial equator? (4 points)

A star has right ascension of 5 hours. Which of these statements is correct about the star? (4 points)

The table below shows the right ascensions of two stars at a location. Name of star Right ascension (in hours) Star 1 1 Star 2 3 What is the interval between the times when the two stars cross the meridian at the location? (4 points)

Which of the following is the smallest single component of a typical soil? (2 points)

Which aspect of soil characteristics is a soil triangle used for? (2 points)

Which of the following best approximates the percentages of sand, clay, and silt in a sandy loam? Use the soil texture table below to answer. (2 points) Public Domain

Which process of soil erosion is being prevented by the structure shown below? (2 points) Public Domain

You’ve tested your patient’s blood and gotten the following result. Red indicates a reaction and white indicates no reaction. What blood type is it safe for this patient to RECEIVE?