The extrusive igeous rock cools very fast and is made by lava, but because it cools so fast extrusive igneous rocks they have really small crystals. Now the intrusive igneous cools really slow beneath the surface, and is made by magma.
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The primary reason for low agricultural productivity in Africa is that Africa lacks infrastructure and uses technology sparingly.
<h3>What is agricultural productivity?</h3>
The ratio of agricultural outputs to inputs is used to calculate agricultural productivity. This productivity is defined to as crop yield, the variety of products makes measuring overall agricultural output difficult.
Therefore, the primary reason for Africa's low agricultural productivity is a lack of infrastructure and a conservative use of technology.
Learn more about the agricultural productivity, refer to:
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Answers:
1. A Topo map or Topographic map shows natural features like lakes, rivers, mountains, etc.
2. A political map shows borders and cities
3. A thematic map shows the density of a population and income
4. A physical map shows the physical features of an area, such as the mountains, rivers and lakes.
5. A climate map shows the climates of each region like deserts, tundras, rainforests, etc.
6. An Economic maps are used to facilitate planning and forecasting the development and location of productive forces as well as for management of the national economy.
7. A road map shows all highways and roads in the world.
8. A heat map shows the temperature of each country.
9. similar to the Topo map, the choropleth map shows the density of a population of each region/country.
Magma contains the same éléments as Earth's crust
