Answer the question below: A rock has more mass than a pebble. Which object will exhibit a smaller force of attraction rock or pebble? Assuming that: The greater the objects mass, the greater the force of attraction; in addition, the greater the distance between objects, the smaller the force of attraction.
pebble

Answer the question below: Water found on Earth's hot regions is more or less dense that water found on Earth's cold regions? Assuming that: Water becomes more dense when it is colder and when it has more salt.
less

Answer the question below: Ian wants to produce more pollutants, so he buys a car that is a plug-in hybrid. The car will run on electricity worse if it's plugged in for a longer time or shorter time? Assuming that: Plug-in hybrids run for a longer time on electricity and so are less polluting than regular hybrids.
shorter time