Answer:
Thai Binh Duong, An Do Duong, Bac Bang Duong
The answer is a. north of equator.
Areas of tundra lies in the northern hemisphere, having part of North America, Greenland and Eurasia. It has latitude and longitude 71.2° North and 156° West. The temperature in tundra region is very low and precipitation is also very less. The growing season is very short and vegetation is dominated by small sized shrubs only.
Your answer would be Tectonic.
Tectonic plates move in various directions, and move slowly. Due to the movement of tectonic plates the earth cracks, and shakes which is called an earch quake. Tectonic plates move constently everyday, and you can't feel it because it's slow. Wehn tectonic plates move quickly, the earth starts to shake. The most common places that have tectonic plates have a higher chance of having an earthquake, even a tusnami.