Which of the following statements is false?
a) The chromosphere is composed of spicules that look like blades of burning grass and are 700km across and up to 7,000km high.
b) The temperature in the chromosphere decreases with increasing altitude.
c) The photosphere is composed of granules, each about 1000km across, which are convection areas of rising and falling gas.
d) The average temperature of the chromosphere is about 10,000°C.