Igneous rock solidification
The apertheid is a policy that governed relations between South Africa's white minority and nonwhite majority and sanctioned racial segregation and political and economic discrimination. Hope this helps. Have a nice day. Feel free to ask more questions.
Answer:
Thermal power and irrigation remained the two main water users in 2015, and the total withdrawal for thermal power decreased but increased for irrigation.
Answer:
The spatial distribution of populations and settlements across a country and their interconnectivity and accessibility from urban areas are important for delivering healthcare, distributing resources and economic development. However, existing spatially explicit population data across Africa are generally based on outdated, low resolution input demographic data, and provide insufficient detail to quantify rural settlement patterns and, thus, accurately measure population concentration and accessibility. Here we outline approaches to developing a new high resolution population distribution dataset for Africa and analyse rural accessibility to population centers. Contemporary population count data were combined with detailed satellite-derived settlement extents to map population distributions across Africa at a finer spatial resolution than ever before. Substantial heterogeneity in settlement patterns, population concentration and spatial accessibility to major population centres is exhibited across the continent. In Africa, 90% of the population is concentrated in less than 21% of the land surface and the average per-person travel time to settlements of more than 50,000 inhabitants is around 3.5 hours, with Central and East Africa displaying the longest average travel times. The analyses highlight large inequities in access, the isolation of many rural populations and the challenges that exist between countries and regions in providing access to services. The datasets presented are freely available as part of the AfriPop project, providing an evidence base for guiding strategic decisions.
Explanation:
For example, use the food web of a savannah biome.
Let's say the hippos all disappeared. Because the hippos are prey for the tertiary predators like a hyena, the population of the predators would decrease while the population of the grass increased.
If the predators disappeared the preys' population would spiral out of control and all the primary producers like leaves and grass would become scarce. Additionally, the decomposing carcass of animals like dead predators and prey create food for microorganisms which make fertile soil; thus, causing the land to become barren.
