The energy that comes from nuclear fusion on the Sun produces most of the energy on Earth. The solar energy that is impacting Earth can be used to generate electricity and heat. Electricity is either converted by solar cells (called photovoltaic) or through solar power plants.
General Weights. Solid rock is estimated at 2.5 to 3tons per cubic meter. If rock is crushed into uniform sizes, the presence of open space between the particles causes the load to be lighter -- approximately 1.6 tons per cubic meter.ixed sizes of crushed rock can range from 1.6 to 2.2 tons per cubic meter. Weighing in at .92 tons are masonry sand, building sand, and stone chips or flakes. These are some of the lightest materials. The next level, at just under one ton, are concrete sand and airfield sand.
The demand for crushed stone is determined mostly by the level of construction activity, and, therefore, the demand for construction materials. U.S. production of crushed stone recorded a significant growth in the past 40 years, from 229 million metric tons in 1950 to 1.1 billion metric tons in 1990.he demand for crushed stone is determined mostly by the level of construction activity, and, therefore, the demand for construction materials. U.S. production of crushed stone recorded a significant growth in the past 40 years, from 229 million metric tons in 1950 to 1.1 billion metric tons in 1990.