Answer the following question given this paragraph: Graphite is one of three forms of crystalline, or crystal-forming, carbon. Carbon also exists in an amorphous, or "shapeless," form in substances such as coal and charcoal. Different forms of the same element are called allotropes. Besides graphite, the other allotropes of crystalline carbon are diamond and fullerenes. All three forms exist as crystals rather than molecules. In a crystal, many atoms are bonded together in a repeating pattern that may contains thousands of atoms. The arrangement of atoms in the crystal differs for each form of carbon and explains why the different forms have different properties. For an entertaining, video-game introduction to the three forms of crystalline carbon, go to this URL: http://www. youtube. com/watch?v=GIHmfBsHsCY . Q: Different forms of the same element are called what? Choices: - subclasses - amines - polymorphs - allotropes A:
allotropes
Answer the following question given this paragraph: Composite volcanoes are common along convergent plate boundaries. When a tectonic plate subducts, it melts. This creates the thick magma needed for these eruptions. The Pacific Ring of Fire is dotted by composite volcanoes. Q: What happens to a tectonic plate when it subducts? Choices: - it warms - it cracks - it sinks - it melts A:
it melts
Q: Answer the following question given this paragraph: An electromagnetic wave consists of vibrating electric and magnetic fields. Q: In addition to a vibrating electric field what does an electromagnetic wave consist of? Choices: - radiation field - molecular field - gravitational field - magnetic field A:
A: magnetic field
Question: Answer the following question given this paragraph: If the rocks on one or both sides of a fracture move, the fracture is called a fault ( Figure below ). Faults can occur alone or in clusters. A cluster of faults creates a fault zone . Earthquakes happen when rocks break and move suddenly. The energy released causes an earthquake. Q: What is the fracture called when rocks on both sides move? Choices: - a crevice - a shear - a stress fracture - a fault A:
Answer: a fault
*Question*
Answer the following question given this paragraph: The transition metals are an interesting and challenging group of elements. They have perplexing patterns of electron distribution that don't always follow the electron filling rules. Predicting how they will form ions is also not always obvious. Q: What kind of metals have perplexing patterns of electron distribution that don't always follow the electron filling rules? Choices: - solution - transformation - variating - transition A:
**Answer**
transition
Q: Answer the following question given this paragraph: For the first 4 billion years of Earth history there is only a little evidence of life. Organisms were tiny and soft and did not fossilize well. But scientists use a variety of ways to figure out what this early life was like. Note that the period from Earth's origin to the beginning of the Phanerozoic is called the Precambrian. Q: What is the period from earth's origin to the beginning of the phanerozoic eon? Choices: - Paleolithic - Cenozoic - anatolian - precambrian A:
A: precambrian