Answer:
I think it is D i am 55% sure
Primitive subsistence agriculture is also known as slash- and-burn agriculture.
Vast flat areas does NOT describe the land of the Czech Republic.
Answer:
Changes in the pressure create the flow of the air to move up and down in the ear and thus create popping sound.
Explanation:
- The ear-popping is caused by the phenomenon of the opening of the Eustachian tube when one swallows and it might be automatically when you blow our nose or are setting in an airplane and this sound is created when the air enters the middle ear through the tube.