Q: Solar and wind are still expensive compared to what? Choices: - electricity - coal fuels - batteries - fossil fuels A:
fossil fuels

Q: When you are walking on a sidewalk, what occurs between your shoes and the concrete each time you put down your foot? Choices: - movement - progress - grip - static friction A:
static friction

Q: Q: An oxy-acetylene torch is an effective way to cut what? Choices: - coal - wood - plastic - metal A:
A: metal

Question: Q: What property is characterized by eddies and swirls that mix layers of fluid together, unlike laminar flow? Choices: - combustion - compression - evaporation - turbulence A:
Answer: turbulence

*Question*
Q: What is the term for a period when temperatures are cooler than normal causing glaciers to spread to lower latitudes? Choices: - cooling era - cold age - freezing point - ice age A:
**Answer**
ice age

*Question*
Q: What causes eutrophication to occur? Choices: - excess of decreased and other nutrients - excess of carbonate and other nutrients - excess of increased and other nutrients - excess of fertilizers and other nutrients A:
**Answer**
excess of fertilizers and other nutrients