Question

give 2 constructive effects of a volcano.

Answer 1

effect of benefits :
 I guess the main good effect that volcanoes have on the environment is to provide nutrients to the surrounding soil. Volcanic ash often contains minerals that are beneficial to plants, and if it is very fine ash it is able to break down quickly and get mixed into the soil

1) forest reproduction by volcano
2)volcano ash have more minerals so good for plant growth
3)some inner minerals exit via lava (including gold minerals,ore,etc)

Answer 2

1 the Lava and ash deposited during and eruption breakdown to provide valuable nutrients for the soil and thus create fertile which is good for agriculture

2 the place that have high level of heat due to volcanic activity inside the earth have higher potential energy for generating geothermal energy