A measure of the ease with which a smooth surface of a mineral can be scratched, or of its resistance to abrasion. In 1822 the Austrian mineralogist Friedrich Mohs devised a scale based on one mineral's ability to scratch another.He placed 10 minerals in order from softest to hardest, giving a relative hardness value of 1 to the softest mineral, and 10 to the hardest.ather, it is a method of gauging the relative hardness of a mineral. If a mineral cannot be scratched by a knife blade but can be scratched by quartz then its hardness is between 5 and 7 (stated as 5-7) on Mohs scale.
Insects in the family Tettigoniidae are commonly called katydids or bush crickets. More than 6,400 species are known. Part of the suborder Ensifera, Tettigoniidae is the only family in the superfamily Tettigonioidea. Primarily nocturnal in habit, with strident mating calls, many katydids exhibit mimicry and camouflage, commonly with shapes and colors similar to leaves.
The safety bureau is commanded by the Emergency Management Coordinator. The divisions within the bureau include safety, code compliance, and emergency management. The safety division is responsible for developing, implementing, and promoting the Katy ISD comprehensive safety program. In order to accomplish this task the division works with many other departments and programs throughout the District. General responsibilities include workplace safety, classroom safety, and safety training. In addition the division is responsible for developing and supporting the school crossing guard program. The code compliance division ensures the District is in compliance with applicable state statutes and local codes pertaining to life safety, public health, and the Americans with Disabilities Act.