Which of the following happens when a low-mass star runs out of fuel? choose all that apply.
a. its outer layers expand, and the star becomes a red giant.
b. its outer layers form a nebula, or a vast cloud of gas and dust.
c. its core becomes a white dwarf.
d. gas and dust in a nebula contract to form a protostar.

Soil is made of air water organic material minerals weathered rock

Which of the following terms best characterizes the government of somilia

Technology has affected regional settlement patterns in what ways? choose all that apply. climatic improvement strategies have improved crop productivity. mechanized agricultural methods have improved agricultural productivity. participation in the global economy has increased urbanization. population shifts from urban to rural areas has increased as a result of petroleum production. settlement areas have increased as a result of improved water storage and delivery systems.