Earths atmosphere, oceans, and continents began to form during the first several hundred million years of precambrian time.. a. true.. b. false. a mold forms when minerals replace all or part of an organism.. a. true. b. false. short how are a mold and a cast related? .

The answers to your question are the following:
#1 Yes its true! The earth is formed around 4.54 billion years ago much of the earth was molten at first. 
#2. The answer would be False its because molds forms when hard parts of an organism are buried in sediments. 
#3 They are both similar in that they both holds the shape or a part of an organisms