Description : Secondary sewage treatment is mainly a (a) physical process (b) mechanical process (c) chemical process (d) biological process.
Last Answer : (d) biological process.
Description : The two most practical means of the home owner to control insects and diseases are: a. Mechanical and chemical b. Mechanical and biological c. Chemical and biological d. Biological and natural
Last Answer : Mechanical and biological
Description : The main process to purify water by filtration, is (A) Mechanical straining (B) Flocculation and sedimentation (C) Biological metabolism (D) All the above
Last Answer : (D) All the above
Description : Explain any two types of weathering: - 1. Mechanical Weathering 2. Chemical Weathering 3. Biological Weathering. 4. Spheroidal Weathering.
Last Answer : 1. Mechanical Weathering: - a) In mechanical weathering the rock surface is broken into smaller pieces without any chemical change. b) In mechanical weathering the smaller broken smaller rock ... rock. c) The main factor that affects chemical weathering are hydration, carbonizations, oxidation.