Answer the following question given this paragraph: The earliest Earth did not have an atmosphere or free water. The planet was far too hot for gases and water to collect. The atmosphere and oceans that we see today evolved over time. The gases came from volcanic eruptions and from comets. Q: Gases on earth originated from comets and what events? Choices: - supernovas - black holes - tides - volcanic eruptions A:
volcanic eruptions
Answer the following question given this paragraph: The heat that is either absorbed or released is measured in joules. The mass is measured in grams. The change in temperature is given by , where is the final temperature and is the initial temperature. Q: In what unit is heat measured in? Choices: - velocities - thermals - amperes - joules A:
joules
Q: Answer the following question given this paragraph: Hardness helps determine how an element (especially a metal) might be used. Many elements are fairly soft (silver and gold, for example) while others (such as titanium, tungsten, and chromium) are much harder. Carbon is an interesting example of hardness. In graphite (the "lead" found in pencils) the carbon is very soft, while the carbon in a diamond is roughly seven times as hard. Q: Although they differ vastly in hardness, pencil lead and diamonds both contain what element? Choices: - graphite - hydrogen - oxygen - carbon A:
A: carbon
Question: Answer the following question given this paragraph: Diamonds like the one pictured in the Figure below are the hardest of all minerals. Is a diamond a crystalline or an amorphous solid? How do you know?. Q: What is the hardest of all minerals? Choices: - titanium - gold - platinum - diamonds A:
Answer: diamonds
*Question*
Answer the following question given this paragraph: An inclined plane is also a simple machine. The resistance is the weight of the box resting on the inclined plane. In order to lift this box straight up, the effort force would need to be equal to its weight. However, assuming no friction, less effort (a smaller effort force) is required to slide the box up the incline. We know this intuitively; when movng boxes into a truck or onto a platform, we use angled platforms instead of lifting it straight up. Q: An inclined plane is a good example of what kind of machine? Choices: - strong - complex - weak - simple A:
**Answer**
simple
Q: Answer the following question given this paragraph: Gas bubbles get bigger when they are under less pressure. Q: If everything in a system stays the same but the pressure deceases, gas bubbles will change in what way? Choices: - they multiply - they pop - they get smaller - they get bigger A:
A: they get bigger