According to plate tectonic theory, the movement of plates is by thermal energy from earth core. The energy drives convective current which moves the plates.
Answer:
C. Carbon dioxide levels would decrease in the atmosphere as the weathering rate increased, acting as a positive feedback
Explanation:
The CO₂ concentration decreases due to large scale weathering process of silicate and carbonate weathering . The weathering of silicate and carbonates affect this way . As CO₂ in the atmosphere decreases the global temperature decreases , resulting in global cooling or ice age. During ice age we will have less precipitation .
Answer: 8
Explanation:
From the question, we are informed that we should find d(21) in the sequence given by d(n) = 2+0.4(n-1). This will be:
d(n) = 2+0.4(n-1)
d(21) = 2 + 0.4(21 - 1)
= 2 + 0.4(20)
= 2 + 8
= 10
Therefore, based on the above calculation, we can deduce that the 21st term is 8.