1. Dr. Bayul studies rock formations all over the world. She is working on a study of two rock formations. The information from the study is as follows:
• Rock A formed from liquid rock.
• Rock B formed from small pieces of rock in a different place.
• Rocks A and B formed at about the same time.
Are Rocks A and B the same or different types of rock?
The rocks are
a the same type because they both formed from rock material.
b the same type because they formed at the same time.
c different types because they formed in different ways.
d different types because they formed in different places.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

hurricanes form in warm water

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.