Mars was once similar to Earth in that

A. it had only one moon.

B. liquid water flowed on its surface.

C. it showed evidence of plate tectonics.

D. its atmosphere had a thin layer of carbon dioxide.

Why do scientists use scientific notation?

Qué ocurre con el espectro cuando se interpone el celofán de colores?

An electric current that is varied to represent information is a (n) a. electronic signal b. digital signal c. integrated circuit d. electromagnetic wave

Find δerxn for the combustion of naphthalene. the heat capacity of the calorimeter, determined in separate experiment, is 5.11kj/∘ c.

If it takes 42 minutes to load 3 1/2 trucks, how many minutes will it take to load 6 1/2 trucks?

For glass fragments to be individualized, what must be true? A. They must fit together B. They must have the same density C. They must look the same D. They must be the same color

In what way would a digital thermometer be preferable to those from a liquid-based thermometer? Digital thermometer readings are easier to use when performing calculations.

Why does the core of the sun contain more helium and less hydrogen than the surface of the sun?

What happens to a light ray passing through the center of a lens?

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.870 m/s at an angle of 35.0° above the table, and it lands on the magazine 0.0770s after leaving the table. Ignore air resistance.