Open QuestionWhich of the following is an indication that a substance has undergone a chemical change?473views
Open QuestionIf two substances are mixed and a new substance is formed, what type of change is it?450views
Open QuestionWhich of the following summarizes a change that takes place as a solid turns to a liquid?469views
Open QuestionHow do chemical weathering and deposition contribute to the formation of the features shown here?460views