If dumps have a negative impact on the environment, then what generally has a negative impact on the environment? Answer choices: - mold - schools - deserts - dumps - drought - disease - recycling centers - thrift stores
dumps

If the vanes rotating in an electric fan causes wind, then the vanes rotating in an electric fan causes? Answer choices: - sound - heat - wind - current - motion - speed - Lift - vibration
wind

If high pressure systems cause good visibility, then what causes good visibility? Answer choices: - permineralization - focusing a lens - high pressure systems - flashlights - peachleaf willow - the Great Barrier Reef - an electron microscope - windpower operated machines
high pressure systems