Jawaban:

1.

a. man-made

b. natural

c. man-made

d. man-made

e. natural

2.

a. because the ground may erode and cause landslides (especially on cliffs)

b. because an earthquake may cause cracks and landslides on the ground, especially if it's big

c. we must plant more trees, avoid making fields directly above a cliff, avoid building houses directly above or below cliffs

Penjelasan:

1a, c, e itu man-made karena perubahan tersebut disebabkan manusia (pertambangan, penebangan hutan, pengambilan tanah)

1b dan e itu natural karena hal tersebut disebabkan alam (gunung berapi dan gempa)

Semoga membantu :D