15) A rock sample contains 1/4 micrograms of the parent radioactive isotope Potassium-40 and 3/4 micrograms of its daughter isotope Argon-40. If the half-life of this decay is 1.25 giga (or USA billion) years, how old is this rock?
Blog
34) Isotopes have the same number of
34) Isotopes have the same number of
3) Who discovered that Jupiter has moons?
3) Who discovered that Jupiter has moons?
11) Mafic (lava) is a term derived by contracting “magnesium…
11) Mafic (lava) is a term derived by contracting “magnesium” and “ferric”; it is an adjective describing a silicate mineral or rock that is rich in magnesium and:
17) Asteroids and comets are
17) Asteroids and comets are
10) Which of the following helps rock to melt?
10) Which of the following helps rock to melt?
47) A habitable world is defined to be one that
47) A habitable world is defined to be one that
49) Scientists today are interested in searching for life on…
49) Scientists today are interested in searching for life on Mars because:
36) Astronomy has shown us that the Earth
36) Astronomy has shown us that the Earth
14) From lowest energy to highest energy, which of the follo…
14) From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation?