Volcanic eruptions happen when lava and gas are discharged from a volcanic vent. The most common consequences of this are population movements as large numbers of people are often forced to flee the moving lava flow. Volcanic activity can have both positive and negative effects.
Positive effects!
Volcanic materials produce fertile soils. Ash and cinder are natural fertilizers as they are rich in minerals. As lava cools and is eroded by the elements it also adds to soil fertility.
Brazilian plateau is another region where ancient volcanic activity has enriched the soils and allowed coffee production to thrive.
In New Zealand volcanic soils are used in the dairy industry and fruit production.
Negative effects!
Large volcanic eruptions can cause death and the destruction of property. The lava
flow and mud-flows caused by volcanic eruptions can kill people and destroy property as it moves rapidly down the side of the volcano.This volcanic eruption also released poisonous gases such as sulphur
dioxide and carbon dioxide.Agricultural land can also be destroyed by ash following a volcanic
eruption.

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Self-esteem is how you feel about yourself, or the opinion you have about yourself. Everyone has times when they feel a bit low or find it hard to believe in themselves.There are a number of ways in which you can improve your self-esteem.
1. Identify and Challenge Your Negative Beliefs.
2. Identify the Positive things About Yourself.
3. Build Positive Relationships—and Avoid Negative Ones.
4. Become More Assertive and Learn to Say No.
5. Take On Challenges