Tornado, Hurricane, Tsunami, etc
One landform found in Mexico is volcanoes, also mesas and buttes and canyons like the Canon del Cobre in I believe the province of Durango up on the interior plateau so it definitely has a variety of landforms which reflect that it is on the circum-pacific ring of fire and also is partly quite arid.
Answer: I would say the answer is D
Explanation: If population growth wanes the number of middle aged and younger people in the workforce drops. This slows down the production of many things leading to a plethera of problems. A good example of this is the current situation in Japan. They have virtually no population growth and an increasing amount of elderly with no care or support systems.
A globular cluster is a collection of stars in the form of a sphere that orbits a galactic core. Global clusters are generally tightly bound by gravity, making the stellar density higher toward the center, and giving them their spherical shapes. Globular clusters are usually found in the halo of a galaxy.
The fact that the gravitational pull of a globular cluster is rather weak means that a single supernova explosion can blow the interstellar gas out of a globular cluster. This would mean that the gas left is not dense enough to form new stars. After the first generation, globular clusters cease to form new stars because they lack material due to their deficiency in heavy elements.