Fill in the mlanks1. The scientific study of soil is called …………….. . 2. The upper most layer of earth’s crust is …………….. . 3. The pleasant smell after the rain is known as …………….. . 4. The substance responsible for petrichor scent is …………….. . 5. Geosmin is produced by …………….. . 6. The breakdown of parent rock into small particles by the action of wind, water, heat and climate is known as …………….. . 7. The process of formation of soil from weathering is known as …………….. . 8. Natural weathering takes a time period of …………….. . 9. Dead and decayed organic matter that mixes with soil is called …………….. . 10. The factors that contribute to soil composition are called …………….. . 11. The science dealing with the influence of soil on organisms, especially on plants is called …………….. . 12. In soil profile, bed rock is present in …………….. horizon. 13. In soil profile, surface litter is present in …………….. horizon 14. …………….. horizon consists of broken rocks with very little organic matter. 15. …………….. soil is less aerated and water held longer. 16. …………….. soil has good aeration, water held but drains slowly. 17. …………….. soil is well aerated and drains quickly. 18. The ratio of the mass of water held in the soil is called …………….. . 19. Paddy is grown in …………….. soil. 20. Cotton is grown in …………….. soil.