Arsenic

Question 1

River deltas

Answer 1

made of fertile land and water, wetlands

Question 2

problems with river deltas

Answer 2

topography makes it hard to build dams and control water and there’s either too much/little water so hard to manage

Question 3

problems with river deltas

Answer 3

unreliable water sources, spread of diseases, so large deltas rely on ground water for irrigation

Question 4

delta facts

Answer 4

40 large ones in world, most rely on grounwater

Question 5

what is used in Bangladesh from water

Answer 5

hand pumps store 90% of households

Question 6

problems with grounwater

Answer 6

hidden chemicals pass through (arsenic) and contaminate, 70 countries affected by arsenic mainly mining countries, usually poor people who cant afford water treatment, 40,000 deaths a year

Question 7

arsenic facts

Answer 7

arsenic comes from iron hydroxide in rocks, found in shallow water, arsenic gets buried/lithified and stored, not in deep water, associated with buildings

Question 8

what aquifers are safe

Answer 8

brown sands safe, grey sediments aren’t

Question 9

how to find arsenic concentration

Answer 9

drill underground and measure water

Question 10

impacts of arsenic water

Answer 10

reduces 50% rice yield, causes lung/bladder cancer, can get into food chain from irrigation

Question 11

solutions

Answer 11

use deep water pumps, avoid arsenic concentrated water, use other resources (ponds/lakes)

Question 12

positives of deep water pumps

Answer 12

24/7 access, one time payment, low arsenic