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Effects of the international dateline on time are;A day is gained if one travels across the IDL to the EastA day is lost if one travels across the IDL to the West.Info: In simple terms, IDL (International Date Line) is a line that runs from the north to the south in the middle of the earth. Read more about IDL.
Harmful effects of weeds are;Weeds lower the quality of pastures eg lantana camaraAquatic weeds affect fishingSome weeds are poisonous to man and livestock eg Datura stramoniumSome e.g witch weeds (spiga sp) are parasitic to cultivated crops eg maizeSome weeds lower the quality agricultural produceSome weeds act as alternate host for insect pest and others for diseases eg wild oats its an alternate host for rust.Some weeds are allelopathic ie produce poisonous substances that may suppress the growth or germination of cultivated crops.
Effects of mass wasting are;Leads to formation of scars which may leave the land exposed to agents of erosion.May lead to soil erosion leaving the land bare and infertile.May lead to formation of new landforms e.g depressions which may be filled with water to form lakesLandslides may change the course of a river leading to insufficient supply of water downslopeMay lead to formation of fertile soils at the foot of the slope making such places suitable for crop cultivationSome forms of mass wasting like landslides may bury people and lead to loss of lives and destruction of property.
Effects of the movement of tectonic plates are;They cause earthquakesCan lead to formation of fold mountainsCan lead to formation of new oceanic crustMay lead to formation of submarine island/volcanic
Negative effects of the development of motor vehicle transport include;It causes traffic jam especially in urban areas.It contributes to environmental pollution.It damages roads.It causes accidents leading to loss of lives/injuries.Increased crime rate