Alicia gives her brother a push while he is seated on a swing. She finds that after a few seconds, she needs to push again to keep him going. The reason her brother slows down is because the mechanical energy is converted into OPTIONS:
- potential energy that heats the air.
- chemical energy that moves the swing.
- kinetic energy which makes the swing slow down.
- thermal energy that is released into the atmosphere.
A: thermal energy that is released into the atmosphere.

Plate movement can form different features on Earth. The movement of tectonic plates can be both a constructive and a destructive force. At which type of plate boundary is new crust formed? OPTIONS:
- convergent
- subduction
- transform
- divergent
A: divergent

Which of the following remains constant in Earth's carbon cycle? OPTIONS:
- the total mass of available carbon
- the way organisms use carbon
- the physical state of carbon-containing molecules
- the molecule in which a particular carbon atom is found
A: the total mass of available carbon

A large quantity of heavy rain falling in a short time period will most likely OPTIONS:
- reduce the amount of nutrients in the soil.
- increase the number of minerals in the soil.
- reduce oxygen levels in the soil.
- increase the temperature of the soil.
A:
reduce the amount of nutrients in the soil.