Question

1.Explosive magma usually has _____.



high viscosity, high gas content, and high silica content

low viscosity, but high gas and silica content

high viscosity, but low gas and silica content

high viscosity and gas content, but low silica content

2.The most dynamic process of Earth, responsible for creating many geological surface features and activities, is _____.



the carbon cycle

plate tectonics

the nitrogen cycle

the water cycle