Sedimentary deposits formed from organic material tend to include a high amount of OPTIONS:
- iron.
- nickel.
- carbon.
- silicon.
A: carbon.

A worker needs to load a heavy box onto a truck. The worker uses a ramp to move the box because the ramp OPTIONS:
- increases the weight of the box.
- reduces the gravitational force on the box.
- increases the amount of friction on the box.
- reduces the amount of force applied to the box.
A: reduces the amount of force applied to the box.

Which characteristic helps a fox find food? OPTIONS:
- sense of smell
- thick fur
- long tail
- pointed teeth
A: sense of smell

A student tosses a ball into the air. Which force causes the ball to fall back to the ground? OPTIONS:
- gravity
- magnetism
- mechanical
- friction
A:
gravity