*Question*
Q: What produces sound waves that travel outward in all directions in water? Read this paragraph and choose the correct option from the provided answers: During World War II, battleships and submarines carried echo sounders. Their goal was to locate enemy submarines ( Figure below ). Echo sounders produce sound waves that travel outward in all directions. The sound waves bounce off the nearest object and then return to the ship. Scientists know the speed of sound in seawater. They then can calculate the distance to the object that the sound wave hit. Most of these sound waves did not hit submarines. They instead were used to map the ocean floor. Choices: - echo chamber - ultrasound machines - amplifiers - echo sounders A:
**Answer**
echo sounders

*Question*
Q: Which two states of matter have definite volumes? Read this paragraph and choose the correct option from the provided answers: Ice, water, and steam appear quite differently to the eye. If you were to look at these three states of matter on the molecular level, you would see that the arrangement of molecules is very different here as well. However, solids and liquids have definite volumes, unlike gases which tend to take on the shape of their container. In this lesson, you will learn about the unique behavior of gas particles on a molecular level and the basis for kinetic molecular theory. Choices: - bacteria and liquids - GAS AND LIQUIDS - contrasts and liquids - solids and liquids A:
**Answer**
solids and liquids

*Question*
Q: When heat flows into an object, its thermal energy increases and so does its what? Read this paragraph and choose the correct option from the provided answers: When heat flows into an object, its thermal energy increases and so does its temperature. Choices: - matter - speed - color - temperature A:
**Answer**
temperature

*Question*
Q: Monocots and eudicots differ in what type of a leaf's tissue? Read this paragraph and choose the correct option from the provided answers: Choices: - structural - circulatory - reproductive - vascular A:
**Answer**
vascular