Rocks Regents Questions

26. Which igneous rock formed from magma that cooled slowly and is composed of 5% amphibole, 8% biotite, 15% plagioclase feldspar, 37% quartz, and 35% potassium feldspar?

• (1) rhyolite

• (2) granite

• (3) diorite

• (4) scoria

29. The table below shows the chemical formulas for four rock-forming minerals.

Which mineral contains the two most abundant elements by mass in Earth’s crust?

• (1) chalcopyrite

• (2) fayalite

• (3) apatite

• (4) barite

32. Which mineral has cleavage in two directions and is commonly used to manufacture ceramics?

• (1) muscovite mica

• (2) potassium feldspar

• (3) fluorite

• (4) olivine

33. A mixture of rounded pebbles and sand was deposited in a river. Over time, these sediments were compacted and cemented together to form the sedimentary rock

• (1) conglomerate

• (2) sandstone

• (3) breccia

• (4) shale

35. A primary difference between sedimentary rocks and nonsedimentary rocks is that

• (1) nonsedimentary rocks contain an abundance of fossils

• (2) nonsedimentary rocks originate in regions of great heat and/or pressure

• (3) sedimentary rocks are currently found only in marine locations

• (4) sedimentary rocks are formed at plate boundaries

36. Which limestone is classified as inorganic?

• (1) chalk

• (2) coquina

• (3) coral

• (4) travertine

37. The photograph below shows one type of limestone described in the table.

This type of limestone is best identified as...

• (1) chalk

• (2) coquina

• (3) coral

• (4) travertine

Whiteface Mountain, located in the Mount Marcy region, is one of New York State’s highest mountain peaks. Most of the surface bedrock on Whiteface is anorthositic gneiss made up of large, light-colored plagioclase feldspar crystals and dark mineral bands composed of amphibole, pyroxene, and garnet. The foliated crystal alignment in the gneiss was produced during a major tectonic event called the Grenville orogeny. Landslides have exposed steep slopes of this white and gray bedrock on the sides of Whiteface Mountain.

38. In the anorthositic gneiss, the mineral garnet is most likely observed in the

• (1) dark bands, has a red color, and has a hardness of 7.0

• (2) dark bands, has a silver color, and has a hardness of 3.0

• (3) light bands, has a red color, and has a hardness of 3.0

• (4) light bands, has a silver color, and has a hardness of 7.0

Whiteface Mountain, located in the Mount Marcy region, is one of New York State’s highest mountain peaks. Most of the surface bedrock on Whiteface is anorthositic gneiss made up of large, light-colored plagioclase feldspar crystals and dark mineral bands composed of amphibole, pyroxene, and garnet. The foliated crystal alignment in the gneiss was produced during a major tectonic event called the Grenville orogeny. Landslides have exposed steep slopes of this white and gray bedrock on the sides of Whiteface Mountain.

39. The texture of the gneiss indicates that the bedrock

• (1) underwent contact metamorphism

• (2) underwent regional metamorphism

• (3) was bioclastic in origin

• (4) was composed of compacted sediment