Waves produce a disturbance in the material they travel through. As a result, waves travel at different speeds through different materials. Through which of these would sound waves travel at the greatest speed?

Who can you think of that has an a in their first name and a b in their last name?

Aggregation is the process of all of your data. a. gathering b. analyzing c. collecting d. observing

Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.