Which of the following is an example chemical reaction? a. water evaporating
b. dissolving kool-aid powder in water
c. cracking a egg
d. digesting food

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory