a)

1. crater 

2. smoke and ash cloud

3. lava stream

4. rim

5. lava

6. magma

7. slope

b)

1. crater - krater

2. smoke and ash cloud - chmura dymu i popiołu

3. lava stream - potok lawy

4. rim - krawędź

5. lava - lawa

6. magma - magma

7. slope - zbocze