The average increase in temperature with depth of the earth is 1° C for every……meter depth.
a) 1 to 3
b) 10 to 15
c) 20 to 25
d) 35 to 40
At the depth of…kms of the earth, water boils.
a) 3 to 4
b) 4 to 6
c) 1 to 2
d) 15 to 20
Explanation: at 15 km depth, the temperature is 1000 to 1200° C.
EXERCISE:
A change in the community structure of an ecosystem over a period of time is…
a) ecological niche
b) ecological mutation
c) succession
d) genetic drift
In succession, lithoseres takes on…….
a) sand
b) water
c) forest floor
d) bare rock
The amount of energy left after plants have met their respiratory needs is net primary production, which shows up as plant………
a) respiration rate
b) photosynthesis rate
c) biomass
d) food reserve
