Q: How many dimensions can humans see in? Choices: - five - two - one - three A:
three

Q: What are daily changes in the level of ocean water called? Choices: - waves - floods - currents - tides A:
tides

Q: Q: What form does water take on the planet mars? Choices: - plasma - gas - liquid - ice A:
A: ice

Question: Q: What is a collection of fibrin, platelets, and erythrocytes that has accumulated along the lining of a blood vessel called? Choices: - atherosclerosis - embolus - clots - thrombus A:
Answer: thrombus

*Question*
Q: Forces which cause objects to turn around continuously in a circle are known as? Choices: - frictional forces - tension forces - hydrodynamic forces - centripetal forces A:
**Answer**
centripetal forces

*Question*
Q: What is the most commonly used source of energy in the world? Choices: - electricity - wind - water - oil A:
**Answer**
oil