In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank. The soft layer of the earth's (1)____________ on which plants grow is referred to as soil. Soil includes a huge amount of both organic and inorganic (2)________. In the soil, the organic components known as humus are formed from (3)____________ plant and animal remnants. These are combined with weathered particles of various rocks to form soil. Weathering occurs as a result of different chemical and physical (4)__________ that occur on the earth's surface. Soil formation is a (5)__________ process in general. For example, the creation of a 2.5 cm thick soil layer might take more than 1000 years.
Select the most appropriate option to fill in blank no. 1.
In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank. The soft layer of the earth's (1)____________ on which plants grow is referred to as soil. Soil includes a huge amount of both organic and inorganic (2)________. In the soil, the organic components known as humus are formed from (3)____________ plant and animal remnants. These are combined with weathered particles of various rocks to form soil. Weathering occurs as a result of different chemical and physical (4)__________ that occur on the earth's surface. Soil formation is a (5)__________ process in general. For example, the creation of a 2.5 cm thick soil layer might take more than 1000 years.
Select the most appropriate option to fill in blank no. 1.