The variables for this experiment include the height of the track and the speed of the car. use the drop-down menus to complete the sentences and identify the independent and dependent variables. the independent variable, or the one that is intentionally manipulated, is . the dependent variable, or the one the response is measured in, is .

i believe the answer is c

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in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

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