Solar lights have a solar panel, control board, photocell sensor, Ni-Cad batteries and a LED (light emitting diode) bulb. The solar panel captures the sun's photonic energy during the day. This electrical current is stored in the Ni-Cad (nickel-cadmium) batteries. The photocell sensor detects available light and the control board regulates flow into the battery. When the photcell sensor detects darkness, the charge stored in the battery is released to power the LED bulb during the evening. Of a morning, the light is switched off to recharge the batteries. Multi crystalline powered solar lights need full sun to charge however amorphous solar panels are still able to charge in overcast conditions.
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10,000 tons every year in your back yard. :[
A lot --- a cubic yard of gravel could weigh around 1500 lbs.
well, were goin on winter, shovel/rake for 10 to 15 dollars per yard, remember tht size counts...
You can buy writing chalk from a good arts and crafts shop or some stationary shops. You could also try Amazon or the official Crayola website. You can buy chalk for building from a bulider's yard or building supplier. See the links below.
Feet a linear unit of length equal to 12 inches or a third of a yard Meters (European spelling: metre) A metric unit of measure that equals 39.37 inches. 173 meter = 567.585 301 84 feet