Problem: Determine the topic of the passage. "Developing this idea further, a motorized crane equipped with a drag bucket or clamshell (grabber) that is used to scoop material from the bottom of a body of water is also a dredger." Topic:

A: Dredging

Problem: Determine the topic of the passage. "A thin film is a layer of material ranging from fractions of a nanometer ( monolayer ) to several micrometers in thickness." Topic:

A: Thin film

Problem: Determine the topic of the passage. "Approximately 72% of the planet's surface (~3.6x108 km2) is covered by saline water that is customarily divided into several principal oceans and smaller seas, with the ocean covering approximately 71% of the Earth's surface." Topic:

A: Ocean

Problem: Determine the topic of the passage. "Memphis had a population of 672,277 in 2011 making it the largest city in the state of Tennessee , the largest city on the Mississippi River , the third largest in the Southeastern United States , and the 20th largest in the United States." Topic:

A:
Memphis, Tennessee