What TWO statements describe events that help drive tectonic plate movement A. convection currents cause hotter magma to rise and cooler magma to sink
B. thermal energy from earths core is transferred outward to the mantle by conduction
C. energy from the sun's heats magma beneath earths surface
D. subduction plates cause cooling at convergent boundaries

Every compound can be represented by a chemical formula. a chemical formula is the set of symbols showing the elements that make up a compound and their proportions. water’s chemical formula is h 2 2 o. that means a molecule of water contains two atoms of hydrogen and one atom of oxygen chemically bonded. a molecule is a group of two or more atoms bonded together. molecules can range in size from two to thousands of atoms. a molecule of a compound is the smallest unit of that compound. every molecule of water has all the physical and chemical properties of water. that’s because every molecule of water is made of the same elements in the same proportions: two hydrogen atoms and one oxygen! which of the following is a true statement? a every molecule of the same compound will have different properties. b every molecule of a compound has the same proportion of elements. c molecules can be physically separated into smaller units of a compound. d molecules cannot be represented by chemical formulae.

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion