A stack of books are sitting on the table. Which force is pulling it down? A. Buoyant force B. Pressure force C. Gravitational force

Who was in control of Afghanistan when the U. S. and Allied forces invaded it in 2001? A. al-Qaeda B. the Taliban C. the Ba'ath Party D. the Mujahadeen

Complete the paragraph to describe the characteristics of the Sun and Rigel, a blue-white supergiant. Rigel and the Sun have similar characteristics, but they also differ in some ways.

When light from the sun warms the ground, the transfer of heat energy is called A) conduction. B) power. C) radiation. D) reflection.

14Carbon has an atomic number of 6, but has 8 neutrons. How many electrons are present in each atom? A.) 6 B.) 8 C.) 14 D.) some have 6 and some have 8

Which is a cause of physical weathering but not of chemical weathering? A. Air B. Wind C. Acids D. Water

Which can be used to prevent initial entry of bacteria into the body

Which statememt describes gravity? Select three options

Unlike solids, gases can

The Doppler effect changes the A) Frequency due to motion B) Speed of sound due to motion C) Speed of light due to motion D) Radar waves in a police car

How many isomers does propane have? 2 6 3 5