Answer: A tsunami is a giant wave (or series of waves) created by an undersea earthquake, volcanic eruption or landslide. Tsunamis are often called tidal waves, but this is not an accurate description because tides have little effect on giant tsunami waves.nswer: A tsunami is a giant wave (or series of waves) created by an undersea earthquake, volcanic eruption or landslide. Tsunamis are often called tidal waves, but this is not an accurate description because tides have little effect on giant tsunami waves.
Roundup is not persistent in the soil. You can lay your sod one week after spraying the weeds. The herbicide will get into the growth of any plant it touches, not anything the chemical does not touch. I don't know of a pre-m herbicide that controls germination of any weeds likely to grow this time of year. Pre-m only prevents weed seeds from germinating.
Why arenât my weeds dead yet? This is all to do with the way Roundup gets to work on weeds. The weed may look healthy still on the outside, but rest assured the plant is dying on the inside. Roundupâs systemic action sees the weed killer moving down through the plant to kill the roots. Usually, within two weeks, the leaf tips will start to wilt and turn brown. Roundup works faster when weeds are actively growing. If weeds are not growing vigourously (e.g. in cold weather, or if the plant is stressed by drought), the process may take up to 4 weeks.