Magma composition <-- Silca plays a major part in determining the form of a volcano.
~Hope this helps!
Answer:
The answer is 5.1852 cm/yr
.
Explanation:
In order to calculate the full seafloor spreading rate in cm/yr, we have to first calculate the half-spreading rate which can be done by simply dividing the given distance (in cm) by time (yr); after calculating the half-spreading rate, we will double it and get the full seafloor spreading rate, thus:
Distance = 3,500 km = 3,500 × 100,000 cm = 350,000,000 cm
Time = 135,000,000 years
The half-spreading rate = distance ÷ time = 350,000,000 ÷ 135,000,000 = 2.5926 cm/yr
.
Therefore, the full seafloor spreading rate = 2.5926 cm/yr × 2 = 5.1852 cm/yr.
Answer:

Explanation:
Given
See attachment
Required
Find x
To find x, we make use of tangent formula

Cross multiply

Make x the subject


--- approximated
This is almost like a mixture of math and geography. If it erodes 2m per 1,000 years and it is asking for how much does it erode over 100,000 years, you multiply 2m by 100. In this case, it erodes 200m per 100,000 years, and 2m per 1,000 years.