The tumbleweed dispersal strategies are unusual among plants; most species disperse their seeds by other mechanisms. Many tumbleweeds (though by no means all) are ruderal species, opportunistic agricultural weeds. Tumbleweeds have been recorded in the following plant families:
The most obvious is temperature. If the air temperature is above 32Â°F snow and ice will start to melt, at or below 32Â° and it will remain frozen. Think about a popsicleâ¦ inside the freezer it stays frozen, outside it starts to melt. The amount of sunshine plays a big factor.
Share with the children that the temperature at which ice melts is called the melting point. The melting point is the temperature at which a solid turns to a liquid. The melting point at which ice â a solid â turns to water â a liquid â is 32Â°F (0Â°C). Invite the children to record their responses in their Ice Investigator Journals.