Q: The rate of decay of carbon-14 does what over time? Choices: - becomes unstable - increases - decreases - remains stable A:
remains stable

Q: What term means the percentage by mass of each element in a compound? Choices: - mass effect - elemental percent - biomass - percent composition A:
percent composition

Q: Q: What type of metal is a good conductor of electricity? Choices: - Tin - Aluminium - zinc - copper A:
A: copper

Question: Q: What part of the plant anchors it into the soil? Choices: - stems - buds - leaves - roots A:
Answer: roots

*Question*
Q: What kind of equal and opposite forces cancel one another out when they act on the same object? Choices: - solid - exact - combined - balanced A:
**Answer**
balanced

*Question*
Q: Eight of the hottest years on record have occurred since what year? Choices: - 2002 - 1997 - 1991 - 1998 A:
**Answer**
1998