A camel<span> train or </span>caravan<span> is a series of </span>camels<span> carrying passengers and/or goods on a regular or semi-regular service between points.</span>
<span>Stage 4 demographic means that the population is stabilized by a low rate of births and deaths. Out of the 4 options it would be most likely that western Europe's population would stabilize this way since it is one of the oldest and advanced, so rapid growth would be low and death rates reduced by advances in medicine.</span>
The focus is the place inside Earth's crust where an earthquake originates. The point on the Earth's surface directly above the focus is the epicenter. When energy is released at the focus, seismic waves travel outward from that point in all directions.