Answer:
NaOH
Explanation:
oxide of a non-metal element is acidic. Na is metal. so NaOH is basic.
Answer:
b. the number of sources of pollution
Explanation:
The U.S. Environmental Protection Agency (EPA) describes the point source pollution as “any particular identifiable cause of pollution from which pollutants are released, such as a channel, ditch, boat or factory chimney”. Factories and sewerage treatment of plants are two well-known types of point sources.
The distinction between the point and non point source pollution is that point cause of pollution which has a single origin or source while non point source pollution is a combination of pollutants from various origins, and not all of them are easily identified.
Answer:
P = 1235.7646 W
Explanation:
Given data:
height of raised sewage = 5.49 m
rate of sewage =1.89*10^6 lt/day
density of sewage = 1.050 kg/m^3
power is written as
work = m g h
h -height
mass lifted per day 
= 1984500 kg
time = 24 hours* 3600 seconds per hour
power
P = 1235.7646 W
Force of gravity =Gxm1xm2 /r^2
G= gravitational constant
m1 and m2 are masses
r is the distance between masses.
So a is the correct option
Answer:
The outer core is a liquid
Explanation:
The outer core is a fluid composed of iron and nickel
