Sunspot activity
A) typically varies in number on a roughly eleven-year cycle.
B) was first observed in the late nineteenth century.
C) typically has the same number of sunspots per year.
D) has been conclusively linked to climate changes.
Answer: A
Environmental & Atmospheric Sciences
You might also like to view...
Why is it so difficult to determine how fast sea level is rising?
What will be an ideal response?
Environmental & Atmospheric Sciences
What is the movement of water over Earth’s surface?
A. evaporation B. precipitation C. streaming D. runoff E. welling
Environmental & Atmospheric Sciences
The ____ climates occupy the largest area of Earth
a. tropical (A) b. arid (B) c. mesothermal (C) d. polar (E)
Environmental & Atmospheric Sciences
A wave breaks against shore when the ratio of wave height to water depth is about ____
a. 1:3 b. 1:7 c. 2:3 d. 2:5 e. 3:4
Environmental & Atmospheric Sciences