About
About Us
Help
Privacy Policy
Terms of Service
LearnDesk
Learn
Academics
Business
Creative
Health and Fitness
Lifestyle
Personal Development
Software
Topics
Admissions
Engineering
Hardware
Hospitality
Humanities
Chinese
Languages
Maths
Pharma
View All Topics
Topics
Accounting
Advertising
Analysis
Analytics
Business Communication
eCommerce
Entrepreneurship
Finance
Finance - India
Freelancing
View All Topics
Topics
Arts & Crafts
Audio Editing
Audio Production
Dance
Design
Film Production
Music
Photography
Video Production
Writing
View All Topics
Topics
Dieting
Fitness
Food Safety
Games
Medical
Medical Professionals
Meditation
Mental Health
Pregnancy
Safety & First Aid
View All Topics
Topics
Beauty & Makeup
Food
Fashion
Gaming
Home Improvement
Parenting
Pet Care & Training
Relationships
Sustainable Living
View All Topics
Topics
Career Development
Learning
Religion and Spirituality
Self-Improvement
View All Topics
Topics
Accounting
Amazon Web Services
App Development
Continuous Integration
Backup Software
Business Automation
Computational Fluid Dynamics
Business Intelligence
Computer Aided Design (CAD)
View All Topics
Teach
Teach Online
Schedule
Items
Billing
Users
Marketing
Analytics
Settings
Change School
Account
Log In
Sign Up
Browse
Live Classes
Recorded Classes
Products
Bundles
Videos
Programs
Academics
Business
Creative
Health and Fitness
Lifestyle
Personal Development
Software
Topics
All topics in Science
Price
Any price
Free
Under $25
$25 to $100
$100 to $500
$500 to $1,000
Over $1,000
Free
Under د.إ100
د.إ100 to د.إ400
د.إ400 to د.إ2,000
د.إ2,000 to د.إ4,000
Over د.إ4,000
Free
Under Kz20,575
Kz20,575 to Kz82,300
Kz82,300 to Kz411,500
Kz411,500 to Kz823,000
Over Kz823,000
Free
Under ARS$6,500
ARS$6,500 to ARS$26,000
ARS$26,000 to ARS$130,000
ARS$130,000 to ARS$260,000
Over ARS$260,000
Free
Under A$39
A$39 to A$156
A$156 to A$780
A$780 to A$1,560
Over A$1,560
Free
Under ৳2,750
৳2,750 to ৳11,000
৳11,000 to ৳55,000
৳55,000 to ৳110,000
Over ৳110,000
Free
Under Лв45.75
Лв45.75 to Лв183
Лв183 to Лв915
Лв915 to Лв1,830
Over Лв1,830
Free
Under Bs175
Bs175 to Bs700
Bs700 to Bs3,500
Bs3,500 to Bs7,000
Over Bs7,000
Free
Under B$122.50
B$122.50 to B$490
B$490 to B$2,450
B$2,450 to B$4,900
Over B$4,900
Free
Under P337.50
P337.50 to P1,350
P1,350 to P6,750
P6,750 to P13,500
Over P13,500
Free
Under CA$34.50
CA$34.50 to CA$138
CA$138 to CA$690
CA$690 to CA$1,380
Over CA$1,380
Free
Under CHF 25
CHF 25 to CHF 100
CHF 100 to CHF 500
CHF 500 to CHF 1,000
Over CHF 1,000
Free
Under CLP$20,150
CLP$20,150 to CLP$80,600
CLP$80,600 to CLP$403,000
CLP$403,000 to CLP$806,000
Over CLP$806,000
Free
Under CN¥180.50
CN¥180.50 to CN¥722
CN¥722 to CN¥3,610
CN¥3,610 to CN¥7,220
Over CN¥7,220
Free
Under COP$103,925
COP$103,925 to COP$415,700
COP$415,700 to COP$2,078,500
COP$2,078,500 to COP$4,157,000
Over COP$4,157,000
Free
Under ₡13,575
₡13,575 to ₡54,300
₡54,300 to ₡271,500
₡271,500 to ₡543,000
Over ₡543,000
Free
Under Kč545
Kč545 to Kč2,180
Kč2,180 to Kč10,900
Kč10,900 to Kč21,800
Over Kč21,800
Free
Under DKK kr175
DKK kr175 to DKK kr700
DKK kr700 to DKK kr3,500
DKK kr3,500 to DKK kr7,000
Over DKK kr7,000
Free
Under RD$1,375
RD$1,375 to RD$5,500
RD$5,500 to RD$27,500
RD$27,500 to RD$55,000
Over RD$55,000
Free
Under DA3,375
DA3,375 to DA13,500
DA13,500 to DA67,500
DA67,500 to DA135,000
Over DA135,000
Free
Under E£775
E£775 to E£3,100
E£3,100 to E£15,500
E£15,500 to E£31,000
Over E£31,000
Free
Under ብር1,400
ብር1,400 to ብር5,600
ብር5,600 to ብር28,000
ብር28,000 to ብር56,000
Over ብር56,000
Free
Under €25
€25 to €100
€100 to €500
€500 to €1,000
Over €1,000
Free
Under FJ$56.25
FJ$56.25 to FJ$225
FJ$225 to FJ$1,125
FJ$1,125 to FJ$2,250
Over FJ$2,250
Free
Under £25
£25 to £100
£100 to £500
£500 to £1,000
Over £1,000
Free
Under Q200
Q200 to Q800
Q800 to Q4,000
Q4,000 to Q8,000
Over Q8,000
Free
Under GY$5,250
GY$5,250 to GY$21,000
GY$21,000 to GY$105,000
GY$105,000 to GY$210,000
Over GY$210,000
Free
Under HK$200
HK$200 to HK$800
HK$800 to HK$4,000
HK$4,000 to HK$8,000
Over HK$8,000
Free
Under L625
L625 to L2,500
L2,500 to L12,500
L12,500 to L25,000
Over L25,000
Free
Under Ft8,750
Ft8,750 to Ft35,000
Ft35,000 to Ft175,000
Ft175,000 to Ft350,000
Over Ft350,000
Free
Under ₪96
₪96 to ₪384
₪384 to ₪1,920
₪1,920 to ₪3,840
Over ₪3,840
Free
Under ₹2,075
₹2,075 to ₹8,300
₹8,300 to ₹41,500
₹41,500 to ₹83,000
Over ₹83,000
Free
Under ISK kr3,350
ISK kr3,350 to ISK kr13,400
ISK kr13,400 to ISK kr67,000
ISK kr67,000 to ISK kr134,000
Over ISK kr134,000
Free
Under ¥3,750
¥3,750 to ¥15,000
¥15,000 to ¥75,000
¥75,000 to ¥150,000
Over ¥150,000
Free
Under KSh3,775
KSh3,775 to KSh15,100
KSh15,100 to KSh75,500
KSh75,500 to KSh151,000
Over KSh151,000
Free
Under ₩32,750
₩32,750 to ₩131,000
₩131,000 to ₩655,000
₩655,000 to ₩1,310,000
Over ₩1,310,000
Free
Under DH250
DH250 to DH1,000
DH1,000 to DH5,000
DH5,000 to DH10,000
Over DH10,000
Free
Under L458
L458 to L1,832
L1,832 to L9,160
L9,160 to L18,320
Over L18,320
Free
Under ден1,411
ден1,411 to ден5,644
ден5,644 to ден28,220
ден28,220 to ден56,440
Over ден56,440
Free
Under MOP$200
MOP$200 to MOP$800
MOP$800 to MOP$4,000
MOP$4,000 to MOP$8,000
Over MOP$8,000
Free
Under MX$425
MX$425 to MX$1,700
MX$1,700 to MX$8,500
MX$8,500 to MX$17,000
Over MX$17,000
Free
Under RM116.75
RM116.75 to RM467
RM467 to RM2,335
RM2,335 to RM4,670
Over RM4,670
Free
Under N$475
N$475 to N$1,900
N$1,900 to N$9,500
N$9,500 to N$19,000
Over N$19,000
Free
Under ₦20,000
₦20,000 to ₦80,000
₦80,000 to ₦400,000
₦400,000 to ₦800,000
Over ₦800,000
Free
Under C$900
C$900 to C$3,600
C$3,600 to C$18,000
C$18,000 to C$36,000
Over C$36,000
Free
Under NOK kr275
NOK kr275 to NOK kr1,100
NOK kr1,100 to NOK kr5,500
NOK kr5,500 to NOK kr11,000
Over NOK kr11,000
Free
Under रु3,300
रु3,300 to रु13,200
रु13,200 to रु66,000
रु66,000 to रु132,000
Over रु132,000
Free
Under NZ$42.50
NZ$42.50 to NZ$170
NZ$170 to NZ$850
NZ$850 to NZ$1,700
Over NZ$1,700
Free
Under S/91
S/91 to S/364
S/364 to S/1,820
S/1,820 to S/3,640
Over S/3,640
Free
Under K90.50
K90.50 to K362
K362 to K1,810
K1,810 to K3,620
Over K3,620
Free
Under ₱1,400
₱1,400 to ₱5,600
₱5,600 to ₱28,000
₱28,000 to ₱56,000
Over ₱56,000
Free
Under ₨7,000
₨7,000 to ₨28,000
₨28,000 to ₨140,000
₨140,000 to ₨280,000
Over ₨280,000
Free
Under zł100
zł100 to zł400
zł400 to zł2,000
zł2,000 to zł4,000
Over zł4,000
Free
Under ₲182,500
₲182,500 to ₲730,000
₲730,000 to ₲3,650,000
₲3,650,000 to ₲7,300,000
Over ₲7,300,000
Free
Under L112.75
L112.75 to L451
L451 to L2,255
L2,255 to L4,510
Over L4,510
Free
Under QR91.25
QR91.25 to QR365
QR365 to QR1,825
QR1,825 to QR3,650
Over QR3,650
Free
Under SAR93.75
SAR93.75 to SAR375
SAR375 to SAR1,875
SAR1,875 to SAR3,750
Over SAR3,750
Free
Under SEK kr275
SEK kr275 to SEK kr1,100
SEK kr1,100 to SEK kr5,500
SEK kr5,500 to SEK kr11,000
Over SEK kr11,000
Free
Under S$34
S$34 to S$136
S$136 to S$680
S$680 to S$1,360
Over S$1,360
Free
Under ฿875
฿875 to ฿3,500
฿3,500 to ฿17,500
฿17,500 to ฿35,000
Over ฿35,000
Free
Under ₺700
₺700 to ₺2,800
₺2,800 to ₺14,000
₺14,000 to ₺28,000
Over ₺28,000
Free
Under $U950
$U950 to $U3,800
$U3,800 to $U19,000
$U19,000 to $U38,000
Over $U38,000
Free
Under R461.50
R461.50 to R1,846
R1,846 to R9,230
R9,230 to R18,460
Over R18,460
Free
Under ZK449.50
ZK449.50 to ZK1,798
ZK1,798 to ZK8,990
ZK8,990 to ZK17,980
Over ZK17,980
Level
Beginner
Intermediate
Advanced
All levels
Environmental Sciences
Follow
Following
Sort by
Popular
Latest
Highest Price
Lowest Price
Ealcafe.com The Environment
By
Michael Ryan Lesser
Learn how to practical English for the 21st-century learner.
Live
Level:
Intermediate
$30
$20
21 Views
Book Class
₩30,000
₩25,000
21 Views
Book Class
₹1,800
₹1,650
21 Views
Book Class
CN¥170
CN¥145
21 Views
Book Class
¥4,427
¥2,951
21 Views
Book Class
£26
£17
21 Views
Book Class
€40
€25
21 Views
Book Class
CA$42.30
CA$28.20
21 Views
Book Class
A$46.48
A$30.98
21 Views
Book Class
S$39.12
S$26.08
21 Views
Book Class
HK$233.55
HK$155.70
21 Views
Book Class
CHF 24.29
CHF 16.19
21 Views
Book Class
NOK kr307.60
NOK kr205.07
21 Views
Book Class
DKK kr194.60
DKK kr129.73
21 Views
Book Class
NZ$53.45
NZ$35.63
21 Views
Book Class
د.إ110.17
د.إ73.45
21 Views
Book Class
৳3,673.59
৳2,449.06
21 Views
Book Class
RM124.50
RM83
21 Views
Book Class
₦43,603.50
₦29,069
21 Views
Book Class
₨8,467.40
₨5,644.93
21 Views
Book Class
฿971.18
฿647.45
21 Views
Book Class
₺1,271.50
₺847.66
21 Views
Book Class
B$162.12
B$108.08
21 Views
Book Class
R521.22
R347.48
21 Views
Book Class
Лв50.93
Лв33.95
21 Views
Book Class
₪98.64
₪65.76
21 Views
Book Class
₱1,763.74
₱1,175.82
21 Views
Book Class
MX$554.34
MX$369.56
21 Views
Book Class
QR109.21
QR72.80
21 Views
Book Class
P403.94
P269.29
21 Views
Book Class
KSh3,877.51
KSh2,585
21 Views
Book Class
E£1,422.53
E£948.35
21 Views
Book Class
ብር4,638.24
ብር3,092.16
21 Views
Book Class
Kz27,510
Kz18,340
21 Views
Book Class
CLP$28,028.03
CLP$18,685.35
21 Views
Book Class
RD$1,891.48
RD$1,260.99
21 Views
Book Class
DA3,922.77
DA2,615.18
21 Views
Book Class
FJ$68.73
FJ$45.82
21 Views
Book Class
Q229.61
Q153.07
21 Views
Book Class
GY$6,269.28
GY$4,179.52
21 Views
Book Class
ISK kr3,830.70
ISK kr2,553.80
21 Views
Book Class
DH278.49
DH185.66
21 Views
Book Class
L511.81
L341.21
21 Views
Book Class
ден1,602.28
ден1,068.18
21 Views
Book Class
MOP$240.29
MOP$160.19
21 Views
Book Class
N$520.81
N$347.20
21 Views
Book Class
C$1,102.65
C$735.10
21 Views
Book Class
रु4,290.55
रु2,860.36
21 Views
Book Class
S/101.28
S/67.52
21 Views
Book Class
K126.80
K84.53
21 Views
Book Class
SAR112.51
SAR75
21 Views
Book Class
ZK691.43
ZK460.95
21 Views
Book Class
L132.59
L88.39
21 Views
Book Class
Kč630.78
Kč420.52
21 Views
Book Class
Ft9,986.10
Ft6,657.40
21 Views
Book Class
SEK kr286.56
SEK kr191.04
21 Views
Book Class
ARS$42,687.91
ARS$28,458.61
21 Views
Book Class
Bs207.06
Bs138.04
21 Views
Book Class
COP$112,786.14
COP$75,190.76
21 Views
Book Class
₡14,998.04
₡9,998.69
21 Views
Book Class
L788.60
L525.73
21 Views
Book Class
₲210,214.82
₲140,143.21
21 Views
Book Class
$U1,192.79
$U795.19
21 Views
Book Class
zł110.42
zł73.61
21 Views
Book Class
Save
Saved
Pollution of Air and Water Class 8
By
Prabh Kirpa Classes
Learn how at an individual level you can help to reduce air and water pollution.
Recorded
Duration:
55 minutes
Included:
5 videos
Level:
All levels
Free
35 Views
Buy Now
Save
Saved
Sign Up
Signup to access thousands of classes
Continue with Facebook
Continue with Google
OR
Continue with Email
Already a member?
Log In
By registering for a LearnDesk account, you agree to our
Terms of Service
and
Privacy Policy
.
Share
Share with friends, get 20% off
Invite your friends to LearnDesk learning marketplace. For each purchase they make, you get 20% off (upto $10) on your next purchase.
Share with Google Contacts