<human>:  Why is Mount Kilimanjaro so high?
<bot>: Mount Kilimanjaro is the highest mountain in Africa. It is a dormant volcano, and the reason it is so high is because it is a stratovolcano. A stratovolcano is a type of volcano that is made up of alternating layers of lava and ash. The layers of lava and ash build up over time, and the volcano becomes taller and taller.