26. What is the name for the process by which rocks are physically and chemically altered by natural agents such as heat and pressure?
a) Weathering
b) Erosion
c) Deposition
d) Metamorphism
27. What is the name for the process by which rocks are melted and then solidified to form new rocks?
a) Weathering
b) Erosion
c) Melting and solidification
d) None of the above
28. What is the name for the texture of an igneous rock that contains large crystals surrounded by a fine-grained matrix?
a) Porphyritic texture
b) Glassy texture
c) Vesicular texture
d) None of the above
29. What is the name for the texture of an igneous rock that is smooth and glassy?
a) Porphyritic texture
b) Glassy texture
c) Vesicular texture
d) None of the above
30. What is the name for the texture of an igneous rock that contains small cavities or bubbles formed by gas trapped in the magma?
a) Porphyritic texture
b) Glassy texture
c) Vesicular texture
d) None of the above
