Ques: Answer the following question given this paragraph: Water is a common chemical substance on planet Earth. In fact, Earth is sometimes called the "water planet" because almost 75% of its surface is covered with water. If you look at Figure below , you will see where Earth's water is found. The term water generally refers to its liquid state, and water is a liquid over a wide range of temperatures on Earth. However, water also occurs on Earth as a solid (ice) and as a gas (water vapor). Q: What is a common chemical substance on planet earth? Choices: - oxygen - nitrogen - hydrogen - water A:
Ans: water

Ques: Answer the following question given this paragraph: Investigation is at the heart of science. It is how scientists do research. Scientific investigations produce evidence that helps answer questions and solve problems. If the evidence cannot provide answers or solutions, it may still be useful. It may lead to new questions or problems for investigation. As more knowledge is discovered, science advances. Q: In science, what process produces evidence that helps answer questions and solve problems? Choices: - information - manipulation - suspension - investigation A:
Ans: investigation

Ques: Answer the following question given this paragraph: A worldwide vaccination campaign by the World Health Organization led to the eradication of smallpox in 1979. Smallpox is a contagious disease unique to humans and is caused by two Variola viruses. The eradication of smallpox was possible because humans are the only carriers of the virus. To this day, smallpox is the only human infectious disease to have been completely eradicated from nature. Scientists are hoping to eradicate polio next. Q: What disease unique to humans and is caused by two variola viruses? Choices: - AIDS - diabetes - ebola - smallpox A:
Ans: smallpox

Ques: Answer the following question given this paragraph: Look at the rock layers pictured below ( Figure below ); they show a feature called Hutton's unconformity. The unconformity was discovered by James Hutton in the 1700s. Hutton saw that the lower rock layers are very old. The upper layers are much younger. There are no layers in between the ancient and recent layers. Hutton thought that the intermediate rock layers eroded away before the more recent rock layers were deposited. Q: As per hutton's unconformity, what happened to the intermediate layers of rock? Choices: - they metamorphized - they fused - they expanded - they eroded away A:
Ans:
they eroded away