I

Question 1

How many percent of Earth is composed of land and it plays an important role in terrestrial organisms?

Answer 1

29%

Question 2

It is unconsolidated regolith modified over time by water, air, and organic material.

Answer 2

SOIL

Question 3

It is a mixture of minerals, air, water, and organic matter in the correct proportions.

Answer 3

FERTILE SOIL

Question 4

It is the study of soil as a habitat for living organisms.

Answer 4

EDAPHOLOGY

Question 5

It is the study of soil as geologic entity, meaning, its
formation, classification, chemistry, and morphology.

Answer 5

Pedology

Question 6

breakdown of rocks from the result of a mechanical action.

Answer 6

Physical weathering

Question 7

• breakdown of rocks through a change in their chemical makeup.

Answer 7

CHEMICAL WEATHERING

Question 8

the breakdown of rocks by living things.

Answer 8

Biological weathering

Question 9

Or the type of rock eroded

Answer 9

Parent material

Question 10

Affects soil quality

Answer 10

Time

Question 11

Affects rate of weathering

Answer 11

CLIMATE

Question 12

and their activities affect formation

Answer 12

Organisms

Question 13

or the land surface

Answer 13

Topography

Question 14

and its different agents

Answer 14

Weathering

Question 15

is determined by the size of the mineral particles within the soil.

Answer 15

Soil texture

Question 16

The largest soil particles which consist of fragments larger than 2.0 millimeters in diameter.

Answer 16

Gravel

Question 17

between 0.05 and 2.0 millimeters

Answer 17

Sand particles

Question 18

range from 0.002 to 0.05 millimeter in diameter

Answer 18

SILT PARTICLES

Question 19

smallest particle which are less than 0.002 millimeter in diameter

Answer 19

Clay particles

Question 20

The ideal soil for agriculture. It provides good aeration and drainage properties of large particles with nutrient-retention and water- holding ability

Answer 20

Loam

Question 21

It is a standard system for classifying soils according to the amount of clay, silt, and sand.

Answer 21

USDA

Question 22

frozen soils

Answer 22

Gelisols

Question 23

Organic wetland soils

Answer 23

Histosols

Question 24

cool, temperate acidic soils.

Answer 24

Spodosols

Question 25

volcanic ash soils

Answer 25

Andisols

Question 26

highly weathered tropical soils

Answer 26

Oxisols

Question 27

shrinking and swelling soils

Answer 27

Vertisols

Question 28

dryland soils

Answer 28

aridisols

Question 29

weathered tropical and subtropical.

Answer 29

Ultisols

Question 30

Grassland soils

Answer 30

Mollisols

Question 31

moderately weathered soils

Answer 31

Alfisols

Question 32

slightly developed soils

Answer 32

Inceptisols

Question 33

undeveloped soils

Answer 33

Entisols

Question 34

are ones that can be used for farming.

Answer 34

Arable lands

Question 35

In a census of Agriculture and Fisheries in 1991, Philippines has 10 million hectares of agricultural lands. ● As of 2020, there is total of 13.42 million hectares of agricultural land in the country.

Answer 35

Agriculture land

Question 36

They are used in planting nipa palm and mangroves in marshes. Oil palm production is successful in some areas in Mindanao due to this soil order.

Answer 36

Histosols

Question 37

They are used to plant fruit trees, bananas, and pineapples.

Answer 37

Andisols

Question 38

They are generally found under cogon, talahib, second-growth bushes, and shrubs, and tree-type species.

Answer 38

Oxisols

Question 39

They are usually used to plant rice and some vegetables.

Answer 39

Vertisols

Question 40

They are usually used to plant pineapple, cassava, sugarcane, banana, and some forest tree species.

Answer 40

Ultisols

Question 41

They are usually used to cultivate coffee, banana, and a variety of other crops.

Answer 41

Mollisols

Question 42

They are usually used to plant bananas and some fruit trees.

Answer 42

Alfisols

Question 43

They are usually used in planting paddy rice, fruit trees, and a diversity of other crops.

Answer 43

Inceptisols

Question 44

They are used in planting diversified crops in the alluvial plains, some fruit trees, paddy rice, and coconuts.

Answer 44

Entisols

Question 45

● This is defined as the change in soil health which results in decreased capacity of soil to support organisms.

Answer 45

Soil degradation

Question 46

include rainfall, runoff, floods, wind erosion, tillage, and mass movements.

Answer 46

Physical

Question 47

activities by organisms and human that degrade the soil

Answer 47

Biological

Question 48

involve reduction of soil quality due to changes in alkalinity and acidity of water.

Answer 48

Chemical

Question 49

Deforestation exposes the soil and affects the retention of water. • Pesticides and fertilizers can alter the composition of soil and organisms. Runoff

Answer 49

Anthropogenic Activities

Question 50

Industries and mining activities reduce nutrients or increase the amount of toxins in the soil

Answer 50

Anthropogenic activities

Question 51

Some areas are more at risk than others.

Answer 51

Areas of concern

Question 52

 It refers to the tilling at right angles to the slope of the land. It is one of the simplest methods of preventing soil erosion.

Answer 52

Contour farming

Question 53

 It is practiced when a slope is too steep or too long.

Answer 53

Strip farming

Question 54

One practical method of preventing soil erosion on a very steep land is to construct terraces.

Answer 54

Terracing

Question 55

are depressions on sloping land where water collects and flows off the land.

Answer 55

Waterways

Question 56

The wind may also cause erosion. are plantings of trees or other plants that protect the bare soil from the full force of the wind. Windbreaks reduce the speed of the wind and decreases the amount of soil that is carried away.

Answer 56

WINDBREAKS

Question 57

the top soil of leaching from which downward percolation of water has removed some clays and soluble ions. It is also commonly rich in organic matters (humus).

Answer 57

A horizon

Question 58

–Thesubsoilofaccumulation. Clays are more prevalent and organic matter is less abundant.

Answer 58

B horizon

Question 59

Thetransitionfromthesoil profile to the unweathered parent material below.

Answer 59

C horizon

Question 60

Air percent

Answer 60

25

Question 61

Water percent

Answer 61

25

Question 62

Mineral particles percent

Answer 62

45

Question 63

Organic matter percent

Answer 63

5

Question 64

Humus percent

Answer 64

80

Question 65

Roots

Answer 65

10

Question 66

Organism

Answer 66

10