1. c) A steep slope Closely spaced contour lines on a map indicate a rapid change in elevation over a short horizontal distance, which represents a steep slope. 2. a) Desert climate Most of North Africa is covered by the Sahara Desert, which is characterized by extremely dry conditions and very little rainfall. 3. a) The Congo Basin The Congo Basin is home to the largest rainforest on the continent of Africa. 4. b) Water vapor Humidity refers to the amount of water vapor present in the air. 5. d) Soil formation Weathering is the process of breaking down rocks, which is a fundamental step in the formation of soil. 6. a) Mechanical weathering Mechanical weathering (also known as physical weathering) breaks down rocks into smaller pieces without altering their chemical composition. 7. a) Through Ethiopia, Kenya, and Tanzania The Great Rift Valley primarily runs through East African countries such as Ethiopia, Kenya, and Tanzania. 8. b) Milky way galaxy The galaxy in which our Earth belongs is called the Milky Way galaxy. That's 2 down. 3 left today — send the next one.