Grade 8 SUB : Science CH 2 Coal and Petroleum W.B. Work
1. Fill in the blanks. a. Brass is a __________ resource. (natural/ human-made) Ans. human-made b. The main constituent of natural gas is _________________ .(methane/propane) Ans. methane c. __________ variety of coal contains 50-70% content of carbon. (Peat/ Lignite) Ans. Lignite d. Naphthalene is used as a __________ repellent. (mosquito/ moth...