Which best explains how thermal energy is transferred when someone holds a hand above a fire? A) It is transferred by conduction and radiation

B) It is transferred by only convection.

C) It is transferred only by conduction

D) It is transferred by convection and radiation.

THE CORRECT ANSWER IS D.

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Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.

Match the formula for the following compound:   magnesium sulfate heptahydratemgs·7h2omg2so4·7h2omg(so4)2·7h2omgso4·7h2o

Acompound has the molecular formula c3h8. which class of organic compounds does it belong to?