*Question*
Q: What are the three main types of rocks? Read this paragraph and choose the correct option from the provided answers: A geologic map shows the different rocks that are exposed at the surface of a region. Rock units are shown in a color identified in a key. On the geologic map of the Grand Canyon, for example, different rock types are shown in different colors. Some people call the Grand Canyon "layer cake geology" because most of the rock units are in layers. Rock units show up on both sides of a stream valley. Choices: - limestone , igneous and metamorphic - plutonic, igneous and metmorphic - crystalline , igneous and metamorphic - sedimentary, igneous and metamorphic A:
**Answer**
sedimentary, igneous and metamorphic

*Question*
Q: What hormone, which is associated with luteinizing hormone and male sexuality, helps bring about physical changes in puberty? Read this paragraph and choose the correct option from the provided answers: What causes puberty to begin? The hypothalamus in the brain "tells" the pituitary gland to secrete hormones that target the testes. The main pituitary hormone involved is luteinizing hormone (LH) . It stimulates the testes to secrete testosterone. Testosterone, in turn, promotes protein synthesis and growth. It brings about most of the physical changes of puberty, some of which are shown in Figure below . In addition to the changes shown below, during puberty male facial hair begins to grow, the shoulders broaden, and the male voice deepens. You can watch an animation of these and other changes that occur in boys during puberty at the Interactive Body link: http://www. bbc. co. uk/science/humanbody/body/interactives/lifecycle/teenagers/ . Choices: - steroids - epinephrine - estrogen - testosterone A:
**Answer**
testosterone

*Question*
Q: How do all musical instruments create sound? Read this paragraph and choose the correct option from the provided answers: All musical instruments create sound by causing matter to vibrate. The vibrations start sound waves moving through the air. Choices: - condensation - stimulation - conduction - vibration A:
**Answer**
vibration

*Question*
Q: What are the high points of a transverse wave called? Read this paragraph and choose the correct option from the provided answers: A transverse wave can be characterized by the high and low points reached by particles of the medium as the wave passes through. This is illustrated in Figure below . The high points are called crests, and the low points are called troughs. Choices: - peaks - troughs - ridges - crests A:
**Answer**
crests