Given the importance of oxygen for animals, researchers suspected that a sudden increase in the gas to near-modern levels in the ocean could have spurred the Cambrian explosion. ... This supported the idea of oxygen as a key trigger for the evolutionary explosion.

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3 years ago

Compare physical maps and political maps

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Main Difference

The key difference between Physical Map and Political Map is that Physical Map indicates the natural features of a place like mountains, waterbodies plains, etc. and The political map shows territorial features like country, cities, nations and their boundaries.

Physical Map vs. Political Map

The difference between a political map and physical map stems from the purpose for which they are created. Before discussing that further, let us first see what a map is. Maps are representations of natural features and landforms on a piece of paper with greatly downscaled ratios. Maps are important as they could be used to locate a place in an unknown area and also used to get directions to reach a particular location. To meet the requirements, different types of maps are available out there. Two important types of maps are the political map and physical map. A physical map is used to show geographic properties of an area such as mountains and rivers, while a political map is one that shows the cities, roads, and borders of different countries. This is the key difference between a political map and physical map, but there are other differences that we will discuss in this article.

Hope this helps :3

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3 years ago