A. Tick the correct option: 1. In addition to the rock particles, the soil contains :
(a) air and water
(b) water and plants
(C) minerals, organic matter, air and water
(d) water, air and plants

2. The water holding capacity is
the highest in:
(a) sandy soil
(b) clayey soil
(c) loamy soil
(d) mixture of sand and loam

3. Which of the following organisms contribute to soil formation?
(a) Bacteria
(b) Fungi
(c) Earthworm
(d) All of these

4. Which type of soil is good for farming?
(a) Clayey soil
(b) Sandy soil
(c) Loamy soil
(d) Both (a) and (c)

5. Which of the following cause soil pollution?
(a) Insecticides
(b) Manure
(c) Fertilizers
(d) Both (a) and(c)

Which terms describe the purpose of antennas on devices that use radio waves? transmit and receivemodify and amplifyamplify and receivemodify and transmit

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)

Carbon 14 is a naturally occurring stable