Match the following:

a. prevent soil erosion

b. narrow zone of contact between lithosphere, hydrosphere and atmosphere

c. productive use of land

d. organic matter deposited on top soil contour ploughing.

i. Land use

ii. Humus

iii. Rock dams

iv. Bio-sphere

i. (c) ii. (d) iii (a) iv. (b)

i. Land use refers to productive and suitable use of land in a way that the health of the soil and land remains intact.

ii. Humus is formed by decomposition of leaves and other weathered plant parts by microorganisms found in the soil. Humus is deposited on the topmost layer of soil.

iii. Rock dams are built across a drainage way to collect the eroded sediments. Rock dams are temporary structures.

iv. Biosphere is also known as ecosphere and is collective of all the ecosystems found in our universe.