Poor air and water quality, insufficient water availability, waste-disposal problems, and high energy consumption are exacerbated by the increasing population density and demands of urban environments. Strong city planning will be essential in managing these and other difficulties as the world's urban areas swell.
Star is to centuries as human is to days. im not sure if this really makes sense but stars live about 10 billion years so a really long time so they represent centuries and humans live on average to 79 so we represent days. if you want or think it makes more sense you could make humans even smaller (hours, minutes, seconds). hope this helped!
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word model is like the model of something eg you are showing something on a 3d model however the other model is something you would see in a magazine or runway
Sinkholes and karst topography are a clear indication that the groundwater is moving through a limestone and forming caves that periodically collapse.
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be suitable for the elderly
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