All land. i hope this helps u!!!!
        
             
        
        
        
Answer:
I will research on troposphere Because:-
 1. Most of phenomena occurs in troposphere 
2. Most of terrain is found in troposphere
 3. It is first layer of atmosphere
 4. It is the nearest layer of atmosphere from the surface of earth
 5. As it contain most of things so there most chance of discovering a new undiscovered thing
Explanation:
Hope this help!!
 
        
             
        
        
        
Answer:
floods, tornadoes, tsunami, storm
 
        
             
        
        
        
Answer:
a mid-ocean ridge
Explanation:
The landform expected to be formed along this margin is a typical mid-ocean ridge.
- A mid - oceanic ridge forms along the margins of a divergent zone. 
- In this place, mafic and ultramafic magma are brought to the surface
- They cool and solidify in such environment. 
- Iceland harnesses the geothermal energy from this diverging boundary to meet some of her energy needs.