Is molten lava heterogeneous

Do magnets have to touch each other in order to experience a magnetic force

Sometimes students are taught that "air expands as it is heated". And sometimes they are taught that "as air expands it cools". Under what conditions could the first statement be true? Under what conditions could the second statement be true?

The name of the SI unit for force is the

What elements had complete outer shells? Give the name and symbol for each

Which of the following technologies would produce the most energy in light waves? A. Halogen lightbulb B. Radio-controlled toy airplane C. Microwave industrial drying equipment D. Ultraviolet disinfecting wand

Which of the following lists the Earth's layers in order from hottest to coldest in temperature? A. outer core, mantle, inner core, crust B. crust, mantle, outer core, inner core C. inner core, outer core, mantle, crust D.

A boy does 465 J of work pulling an empty wagon along level ground with a force of 111 N [31o below the horizontal]. A frictional force of 155 N opposes the motion and is actually slowing the wagon down from an initial high velocity.

Which of the following best explains why the tidal bulges on Earth are larger closest to the Moon compared to the tidal bulges closest to the Sun?

an airplane flies with a constant speed of 600 miles per hour. how long will it take to travel a distance of 2100 miles?

Suppose two waves collide and the temporary combined wave that results is smaller than the original waves. What term best describes this interaction? a. diffraction b. destructive interference c. standing wave formation d. constructive interference