Scientists have had great success designing and sending rovers to Mars. Rovers are equipped with machinery that allows them to conduct experiments and search for past or present conditions that are favorable for sustaining life. The Curiosity rover, pictured below, is about the size of a car and was designed to transmit and receive signals between Earth and Mars for approximately 23 months.

Scientists on Earth are able to communicate with rovers on Mars through their receivers, which can receive and process signals. Which of these best describes the signals sent and received by rovers?
A.
electromagnetic waves
B.
gravitational energy
C.
potential energy
D.
sound waves

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .