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4) There are four major types (or “ranks”) of coal. ... It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter. Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite.
6)example of contact force.....1)Reaction force. An object at rest on a surface experiences reaction force .
2)Tension. An object that is being stretched experiences a tension force.
3)Friction. Two objects sliding past each other experience friction forces.
9) irrigation.....Irrigation is the process of applying water to soil, primarily to meet the water needs of growing plants. ... Various irrigation methods have been developed over time to meet the irrigation needs of certain crops in specific areas. The three main methods of irrigation are surface, sprinkler and drip/micro.
methods of irrigation...1)Surface irrigation. Water is distributed over and across land by gravity, no mechanical pump involved.
2)Localized irrigation.
3)Sprinkler irrigation.
4)Lateral move irrigation
I hope this will be help you.......