Which is not important to say?

a) a solar eclipse happens when the moon passes between the sun and earth.
b) scientists hope to learn new things from solar eclipses.
c) the sun's corona is the outside layer of the sun's atmosphere.
d) there was a total solar eclipse on august 21, 2017.

tending to cause harm

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.