Which of the following represents a chemical change? A. Melting
of ice to water.
B. Combustion of a firecracker
C. Salt dissolves in water
D. The iron stretched into wires-ductile and iron pounded into sheets-malleable.

Research and discuss the aurora borealis in terms of electric charges, magnetic fields, and forces. which times of the year are best for seeing the northern lights, and where are the best places to view them? explain your answers. also identify links to good images. if you’ve ever seen the aurora borealis, describe your experience and note the time and place that you saw it.

What difference are found in the propagation of sound in the media solid,liquid and gas

What is the rapid growth rate of a population after a period of slow growth called? a. exponential growth b. overconsumption c. a point source d. the carrying capacity