What type of substances have a well-defined repeating pattern?

JAMB Physics 2024 80 views

What type of substances have a well-defined repeating pattern?

  1. Amorphous substances
  2. Liquids
  3. Crystalline substances ✓
  4. Gases

Explanation

Ghana Empire (300-1200 CE): controlled trans-Saharan gold-salt trade. Capital: Koumbi Saleh. Declined due to Almoravid attacks and drought. Not located in modern Ghana – further northwest.

Mali Empire (1235-1600 CE): founded by Sundiata Keita, expanded by Mansa Musa. Famous for wealth, Timbuktu scholarship, and Musas pilgrimage to Mecca displaying enormous gold wealth.

Songhai Empire (1464-1591 CE): largest of the three, centered on Gao. Peaked under Askia Muhammad. Fell to Moroccan invasion with firearms. These empires demonstrate Africas pre-colonial sophistication.

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