the question 1 : fill the Root cause field and the Triggers field in this risk register below (they are empty):

note : the two pictures are the same table but because it is big I couldn't upload it as one picture.

^ fill these fields

question 2 : create Risk matrix (create Risk matrix after finishing question 1 and taking a look on the risk register).

here is a sample for risk matrix :

FIGURE 11-5 Sample probability/impact matrix