About how much of Earth's land surface is used for agriculture?

8%

18%

28%

38%

A copper block with a mass of 300 grams is cooled to 77K by being immersed in liquid nitrogen. The block is then placed in a Styrofoam cup containing some water that is initially at + 50.0°C.

Which of the following is not part of testing a hypothesis? A. Making a theory B. Making a model C. Gathering evidence D. Collecting data

You are 12 miles north of your base camp when you begin walking north at a speed of 2 miles per hour. What is your location, relative to your base camp, after walking for 5 hours?

The highest recorded waterfall in the world is found at angel falls in venezuela. its longest single waterfall has a height of 807 m. if water at the top of the falls is at 15.

A shell is fired with 500km/h on a target half kilometer away. In what time in which shell will hit the target.

Ian walks 2 km to his best friend's house, then walks 0.5 km to the library. He then makes a 2.5 km walk home. The entire walk took him 3 hours. What is his average speed in km/h? SHOW YOUR WORK!

What would happen if earth gravity suddenly disappeared?

How many layers of material were the roads made of? a. two c. four b. three d. five

Red light has a shorter wavelength than yellow light.

Approximately what is the parallax angle of a star that is 20 light-years away?