input: OPTIONS:
- radio
- ultrasound
- loop
- echo Now, answer this question: Answer the following question given this paragraph: Did you ever hear an echo of your own voice? An echo occurs when sound waves bounce back from a surface that they can't pass through. The woman pictured here is trying to create an echo by shouting toward a large building. When the sound waves strike the wall of the building, most of them bounce back toward the woman, and she hears an echo of her voice. An echo is just one example of how waves interact with matter. Q: What is heard when sound waves bounce back from a surface that they can't pass through? A:
A:
output: echo

Answer the following question given this paragraph: A heat wave over the United States as indicated by heat radiated from the ground. The bright yellow areas are the hottest, and the blue and white are coolest. Q: In a heat map, what color represents the hottest temperatures? A:

OPTIONS:
- bright red
- orange
- pink
- bright yellow

Answer: bright yellow

Problem: OPTIONS:
- momentum
- friction
- direction
- thrust
Q: Answer the following question given this paragraph: Most halogens have a variety of important uses. A few are described in the Table below . Q: What is the force pushing a rocket called? A:
Answer: thrust

Problem:OPTIONS:
- factor
- mass
- volume
- weight

Answer the following question given this paragraph: Weight is a measure of the force of gravity pulling down on an object. Buoyant force pushes up on an object. Weight and buoyant force together determine whether an object sinks or floats. This is illustrated in Figure below . Q: What is the measure of the force of gravity pulling down on an object called? A:
****
A: weight

Answer the following question given this paragraph: A drug is any chemical that affects the body's structure or function. Many drugs, including both legal and illegal drugs, are psychoactive drugs . This means that they affect the central nervous system, generally by influencing the transmission of nerve impulses. For example, some psychoactive drugs mimic neurotransmitters. At the link below, you can watch an animation showing how psychoactive drugs affect the brain. http://www. thirteen. org/closetohome/animation/neuron-main. html. Q: What word describes any chemical that affects the body's structure or function? A:
OPTIONS:
- treatment
- toxin
- gift
- drug
drug

Answer the following question given this paragraph: In terms of moisture, climates can be classified as arid (dry), semi-arid, humid (wet), or semi-humid. The amount of moisture depends on both precipitation and evaporation. Q: What is the scientific term for climates with the least moisture? A:
OPTIONS:
- mediterannean
- tropical
- polar
- arid

Answer:
arid