The Earth’s interior is composed of several layers: the crust, the mantle and the core. Scientists used waves and their speed to study the Earth's interior. The speed of seismic waves is affected by the properties of the material the waves pass through. The stiffness of material affects the speed of these waves. P-waves, or pressure waves, go through both liquids and solids, while S-waves, or shear waves go through solids but not liquids. The following helped scientists understand that Earth's interior is liquid: S waves cannot travel through liquids. Correct answer: D
St. Augustine
Augustine, Florida, established by the Spanish in 1565. Today, St. Augustine survives as the nation's oldest continuously occupied city, and is now gearing up for its 450th birthday bash.
<span>Fossils symbol and mountain belts are very important
for geologists in deciding where to move the continents.
Fossils and mountain belts can give the
geologist ideas about the history of the certain continents and what are the
animals that stayed and died in that place.
Both can also help the geologists to identify if the particular continent is a
safe place to live on because the animals of a long time ago stayed on that
place. So maybe the place is safe from water high tide and is not a moving
plates.</span>
Answer: D. demographers
Explanation:
When planning for the future of a city, the urban planners need to ensure that the city is able to afford its current and future residents with the facilities needed to provide them with the maximum welfare possible.
To do this the urban planners should reach out to demographers. Demographers study human populations with a view to analyse and ascertain various characteristics such as size, composition, how they are distributed within a geopolitical zone and most importantly, how they will change overtime.
For urban planners to plan for a city that will take care of future residents as well, they would need to know how the kind of future residents they are planning for and this is when they will turn to demographers whose job it is to study and possibly predict future population.
