Which best describes how heat energy moves within a system?
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a. heat energy is lost to the system over time.
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b. heat energy is transferred from warmer objects to cooler objects.
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c. cool objects transfer heat energy to warmer objects.

Why does physical weathering speed up the processes of chemical weathering? a) physical weathering requires abundant water, as does chemical weathering. b) physical weathering produces fresh surfaces for chemical weathering to attack. c) chemical weathering can occur only on small surfaces, not large ones. d) chemical weathering requires salt, which is provided by salt wedging.

Witch one is it soo it the the question b.a,b,c,d

This map shows the member states of the european union (eu). based on this map, what is the most likely reason the eu was formed? a) to increase trade between european nations b) to protect themselves from foreign enemies c) to begin the process of forming one large nation d) to isolate europe from the rest of the international community j