People living in the Sahel region in countries such as the Sudan, Chad, and neighboring Ethiopia suffer from undernourishment, desertification, and food security issues. Define these terms and describe how these factors intersect in the landscape of the Sahel.

The answer to the first one is barometer.

Explosive eruptions are the most hazardous, involving large volumes of tephra and gases emitted from the volcano. lahars, pyroclastic flows, ashfall, and many other volcanic hazards are commonly associated with explosive eruptions. explosive eruptions are very dangerous. basically, any form of hazard can occur.

Answer (b) they're often rural migrants with no title to housing or rights to established businesses