Mexican 7 Layer Dip

1 large carton sour cream 1 pkg. taco mix avocado dip 1 bunch green onions 6 roma tomatoes, chopped 1 can black olives, chopped 1-2 packages cheddar cheese or Mexican mix cheese (shredded).   Mix taco mix into sour cream. Layer each ingredient as listed starting with the taco/sour cream mixture.