7. The Cuyahoga River in Ohio has caught fire eleven times. The last time was in 1969, when
sparks from a train are believed to have ignited
an oil slick on the river. The condition of the
Cuyahoga River most likely helped persuade
Congress to pass which act?
A. the Wilderness Act
B. the Clean Water Act
C. the Flood Control and Coastal Emergency
Act
D. the Marine Protection, Research, and
Sanctuaries Act

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island