The sentence that would best describe the crater is A. Concave because
concave means curves inward like if you cut open a hollow sphere it is a concave shape.
(4) Elevations:
Point A: 900 ft
Point B: 900 ft
Point C: 1500 ft
Point D: 1000 ft
(5) Contour interval: 100 ft
(6) Plot #1 best fits the profile seen in the contour map.
There's really only one step to this problem . . . REMEMBERING Ohm's law.
Current = Voltage / Resistance
The rest is just arithmetic, either on paper or on your calculator.
Current = (1.5 V) / (3 ohms)
<em>Current = 0.5 Ampere</em>
Beryllium has a mass number of 9 and 4 protons. To find the number of neutrons you need to subtract the number of protons from the mass number. so...
neutrons = mass - # protons
neutrons = 9 - 4 = 5