A) The data to support his hypothesis, so he should investigate if the same change happens in the density of solid water.
Hazardous substances are dangerous substances while toxins are poisonous substances. Hazardous substances may cause harm to an individuals health; they include acute toxins such as cyanide; substances harmful after repeated or prolonged exposure such as mercury and silica, among others. Toxic substances can be poisonous or cause health effects.
The greatest difference in high and low tides occur during spring tides when the sun and moon are aligned
