Answer: Glacier
Definition:
a slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles.
When magma reaches the surface gases bubble, often explosively, out of it.
Answer:
The diameter of the tire is 1.274 m
Explanation:
Given;
total length of the street, L = 172 m
let the radius of the tire = r
let the diameter of the tire, d = 2r
In every single turn, a tire covers a distance, D = 2πr
for the total 43 times, the distance covered, D = L = 43 x 2πr
L = 43 x 2πr
172 = 86πr

d = 2r = 2 x 0.637
d = 1.274 m
Therefore, the diameter of the tire is 1.274 m
A volcano with an empty magma chamber would be called a caldera
Explanation: During certain types of explosive eruptions, a volcano's magma chamber may empty enough for an area above it to subside, forming a type of larger depression known as a caldera.
South Africa is an actual country whereas Southern Africa is a region that is made up of several countries