*Question*
If there are more greenhouse gases in the atmosphere, more ultraviolet radiation will be trapped and the Earth will heat up. Tony drives an SUV that contributes many greenhouse gases to the atmosphere. Evan rides a scooter that contributes few greenhouses gases to the atmosphere. Who likely contributes more to the Earth heating up Tony or Evan?
**Answer**
Tony

*Question*
Increasing the number of resistors in a series circuit increases the overall resistance of the circuit. Greta has 15 resistors in series on her circuit, while Evan has 2 similar resistors in series on his circuit. Whose circuit has the greatest resistance Greta or Evan?
**Answer**
Greta

*Question*
An object with greater mass or greater velocity has more kinetic energy. Which object likely contains more energy a pinhead or the sun?
**Answer**
the sun

*Question*
The more branching there is in isomers, the lower the boiling and melting points are. Steel has a lower or higher melting point than lead because it has less branching?
**Answer**
higher