Language Structure Problems

Esperanto

Given the data below, what is the probable meaning for the Esperanto prefix ek-?

1. vidi -- to see
2. bruli -- to burn
3. salti -- to switch on
4. timi -- to fear
5. fluvo -- to rain
6. krii -- to cry
7. ekvidi -- to glimpse
8. ekbruli -- to ignite
9. eksalti -- to leap, to jump up
10. ektimi -- to startle, to panic
11. ekpluvo -- to downpour
12. ekkrii -- to cry out