Ques: Q: What is a common chemical substance on planet earth? Choices: - oxygen - nitrogen - hydrogen - water A:
Ans: water

Ques: Q: In science, what process produces evidence that helps answer questions and solve problems? Choices: - information - manipulation - suspension - investigation A:
Ans: investigation

Ques: Q: What disease unique to humans and is caused by two variola viruses? Choices: - AIDS - diabetes - ebola - smallpox A:
Ans: smallpox

Ques: 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