Natural Science
What part of a plant grows underground?
Roots
On what date does Colombia celebrate its Independence Day?
July 20th
What is the chemical symbol for water?
H2O
What is the name of the political and social system in medieval Europe where lords owned land and peasants worked it?
Feudalism
What is a pure substance made of only one type of atom called?
An element
What gas is released by plants during photosynthesis?
Oxygen
A ball is held at the top of a hill. When released, it rolls down. Explain the energy transformation that occurs.
Potential energy converts to kinetic energy as the ball descends