PPT: Natural Resources | Science & Pedagogy Paper 2 for CTET & TET Exams - CTET & State TET PDF Download

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Natural Resources
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Natural Resources
Natural Resources and 
its Types
Natural resources are raw materials from the earth that 
occur naturally and cannot be made by humans, such 
as air, water, and minerals.
Inexhaustible Natural Resources
Resources available in unlimited quantities that 
naturally renew regardless of human use. 
Examples include sunlight and air.
Exhaustible Natural Resources
Resources available in limited quantities that can 
be depleted through human activities. Examples 
include forests, wildlife, minerals, and fossil fuels 
like coal and petroleum.
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Natural Resources
Natural Resources and 
its Types
Natural resources are raw materials from the earth that 
occur naturally and cannot be made by humans, such 
as air, water, and minerals.
Inexhaustible Natural Resources
Resources available in unlimited quantities that 
naturally renew regardless of human use. 
Examples include sunlight and air.
Exhaustible Natural Resources
Resources available in limited quantities that can 
be depleted through human activities. Examples 
include forests, wildlife, minerals, and fossil fuels 
like coal and petroleum.
Air: The Vital Resource
Composition of Air
Earth is surrounded by a thin layer of air 
called the atmosphere. Air consists of 
nitrogen (78%), oxygen (20.95%), carbon 
dioxide (0.031%), argon (0.93%), and 
trace elements like water vapor and 
particulates (0.04%).
Photosynthesis and respiration maintain 
the oxygen-carbon dioxide balance in the 
atmosphere.
Layers of Atmosphere
The atmosphere consists of temperature-
based layers:
Troposphere: Nearest to earth, extends 
10-15 km upward
Stratosphere: 15-50 km above earth 
(35 km thick)
Mesosphere: 50-80 km above earth
Thermosphere: From 80 km to outer 
space
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Natural Resources
Natural Resources and 
its Types
Natural resources are raw materials from the earth that 
occur naturally and cannot be made by humans, such 
as air, water, and minerals.
Inexhaustible Natural Resources
Resources available in unlimited quantities that 
naturally renew regardless of human use. 
Examples include sunlight and air.
Exhaustible Natural Resources
Resources available in limited quantities that can 
be depleted through human activities. Examples 
include forests, wildlife, minerals, and fossil fuels 
like coal and petroleum.
Air: The Vital Resource
Composition of Air
Earth is surrounded by a thin layer of air 
called the atmosphere. Air consists of 
nitrogen (78%), oxygen (20.95%), carbon 
dioxide (0.031%), argon (0.93%), and 
trace elements like water vapor and 
particulates (0.04%).
Photosynthesis and respiration maintain 
the oxygen-carbon dioxide balance in the 
atmosphere.
Layers of Atmosphere
The atmosphere consists of temperature-
based layers:
Troposphere: Nearest to earth, extends 
10-15 km upward
Stratosphere: 15-50 km above earth 
(35 km thick)
Mesosphere: 50-80 km above earth
Thermosphere: From 80 km to outer 
space
Air Pollution and 
Greenhouse Effect
Air Pollution
Contamination 
by harmful 
substances. 
Primary 
pollutants enter 
directly 
(volcanic ash, 
CO, CFCs), 
while secondary 
pollutants form 
through 
reactions (e.g., 
PAN).
Vehicle 
Emissions
Vehicles release 
CO, CO2, 
nitrogen oxides 
and smoke. 
Carbon 
monoxide 
reduces blood's 
oxygen-
carrying 
capacity, 
potentially 
causing 
suffocation.
Greenhouse 
Effect
Earth's warming 
from heat-
trapping gases. 
Water vapor, 
CO2, and 
methane 
prevent heat 
escape, 
accelerating 
global warming.
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Natural Resources
Natural Resources and 
its Types
Natural resources are raw materials from the earth that 
occur naturally and cannot be made by humans, such 
as air, water, and minerals.
Inexhaustible Natural Resources
Resources available in unlimited quantities that 
naturally renew regardless of human use. 
Examples include sunlight and air.
Exhaustible Natural Resources
Resources available in limited quantities that can 
be depleted through human activities. Examples 
include forests, wildlife, minerals, and fossil fuels 
like coal and petroleum.
Air: The Vital Resource
Composition of Air
Earth is surrounded by a thin layer of air 
called the atmosphere. Air consists of 
nitrogen (78%), oxygen (20.95%), carbon 
dioxide (0.031%), argon (0.93%), and 
trace elements like water vapor and 
particulates (0.04%).
Photosynthesis and respiration maintain 
the oxygen-carbon dioxide balance in the 
atmosphere.
Layers of Atmosphere
The atmosphere consists of temperature-
based layers:
Troposphere: Nearest to earth, extends 
10-15 km upward
Stratosphere: 15-50 km above earth 
(35 km thick)
Mesosphere: 50-80 km above earth
Thermosphere: From 80 km to outer 
space
Air Pollution and 
Greenhouse Effect
Air Pollution
Contamination 
by harmful 
substances. 
Primary 
pollutants enter 
directly 
(volcanic ash, 
CO, CFCs), 
while secondary 
pollutants form 
through 
reactions (e.g., 
PAN).
Vehicle 
Emissions
Vehicles release 
CO, CO2, 
nitrogen oxides 
and smoke. 
Carbon 
monoxide 
reduces blood's 
oxygen-
carrying 
capacity, 
potentially 
causing 
suffocation.
Greenhouse 
Effect
Earth's warming 
from heat-
trapping gases. 
Water vapor, 
CO2, and 
methane 
prevent heat 
escape, 
accelerating 
global warming.
Water: Earth's Precious Resource
Water 
Distribution
Water covers 
71% of Earth in 
solid, liquid, and 
vapor forms, yet 
only 0.006% is 
accessible 
freshwater.
Water Table 
Depletion
Groundwater in 
aquifers is 
declining due to 
population 
growth, 
industry, 
agriculture, and 
poor resource 
management.
Water 
Pollution
Contamination 
through 
physical, 
chemical or 
biological 
changes from 
agricultural 
runoff, sewage, 
and industrial 
waste causes 
diseases like 
cholera and 
typhoid.
Water 
Management
Conservation 
includes 
rainwater 
harvesting to 
recharge 
groundwater 
and drip 
irrigation for 
direct water 
delivery to plant 
roots.