Civil unrest due to collapse of the Songhay Empire, the Timbuktu, by the Morracans in 1591
The extreme desert conditions like extreme climates, excessive heat, lack of water and food etc made the travel logistics very tough. This made people opt for other transport systems
Huge advancements made in maritime travel
Exploration of West African trade routes
Economic, political and social changes which led to the end of trans-Saharan trade routes

6 0

3 years ago

Gas cloud 1is likely to form a star . Gas cloud 2 is not . Based on this information, match the given conditions with each cloud

kondaur [170]

Answer:

1. It spreads with a greater volume and less concentration of elements.
Its temperature stays well below the 14 million Kelvin.
It has hydrogen atoms that retain there electrons.
2. Its volume shrinks and the density increase die to the gravity
Its temperature stays above the 14 million kelvin
Hydrogen atoms shed there electron.

Explanation:

As the star is born within the clouds of dust and is scattered throughout most galaxies. The Orion Nebula is shown in the image that has a turbulence layer of clouds made of gases. These clouds tend to have temperatures of 100 Kelvin thus commonly called the HI clouds.

7 0

3 years ago

Which of the following might be an indicator of global warming?

Yanka [14]

The Global Surface Temperature is Rising

NOAA states:Many lines of scientific evidence show the Earth's climate is changing. This page presents the latest information from several independent measures of observed climate change that illustrate an overwhelmingly compelling story of a planet that is undergoing global warming. It is worth noting that increasing global temperature is only one element of observed global climate change. Precipitation patterns are also changing; storms and other extremes are changing as well.

6 0

3 years ago