Answer:
Demographers study the growth and decline of human populations, and urban planners plan for the futures of cities (e.g. electricity, water, and transportation needs). Demographers and urban planners would benefit from working together to help solve difficult problems in society and to help plan for the future. A demographer would be very helpful to urban planners as they plan for the future of a city. For example, an urban planner would want to have an idea of the population growth in the city, or of the average growth rate in other cities, when planning for the city's future transportation, water, and electricity needs. Demographers and urban planners are important to each other! They help each other plan for the future of society
Explanation:
The shockwave from an undersea earthquake causes 'ripples' in the ocean which are very large swells. When the bottom of the swell touches land, it must build up higher to maintain it's size. Therefore when it approaches the beach, water is drawn away from the beach to compensate for the ocean depth getting shallower under the tsunami swell. More water is drawn from in front of the swell than behind due to the movement of the swell.
the world's current population is 7.3 billion and the world population in 1915 was 1.8 billion. The increase over the past century is 7.3 billion - 1.8 billion = 5.5 billion. So, the correct answer would be "more than 5 billion" (option D).
