Use the drop-down menus to complete the paragraph.
geologists determine absolute age by comparing the amounts of radioactive and nonradioactive elements in
rock. the radioactive, or
elements decay into nonradioactive elements because
this rate of decay is
for each element, geologists can compare the amounts of stable and unstable
elements to determine how much of the
elements have formed over time.

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.