There are two, one for each year.
Answer:
The time span between 1680 and 1766 (lines 1 and 2) is 86 years: 1766 − 1680 = 86 years. During this time, the falls receded an average of 5.8 feet per year: 500 feet ÷ 86 years ≈ 5.8 feet per year.
The time span between 1856 and 1876 (lines 3 and 4) is 20 years: 1876 − 1856 = 20 years. During this time, the falls receded an average of 25 feet per year: 500 feet ÷ 20 years = 25 feet per year.
Explanation:
plato answer ^
Answer: B. Buoyancy
Explanation: The asthenosphere exerts a buoyant force that pushes up against the lithosphere, and this force resists gravity. The theory of isostasy refers to an equilibrium in buoyancy between the lithosphere and the asthenosphere.
