Question

1. why is streak more reliable than color for identifying minerals?

a. color is always inaccurate
b. streak shows the mineral’s powdered color
c. streak measures hardness
d. color changes based on temperature

1. which sequence shows how igneous rock can become sedimentary rock?

a. melting → cooling → crystallization
b. weathering → erosion → deposition → compaction
c. heat → pressure → recrystallization
d. burial → melting → eruption

1. which condition forms metamorphic rock?

a. cooling lava
b. deposition of sediment
c. heat and pressure without melting
d. weathering by water

1. lava that cools quickly at earth’s surface forms

a. intrusive igneous rock
b. extrusive igneous rock
c. sedimentary rock
d. metamorphic rock

dok 3

1. a rock contains visible layers and fossil fragments. what is the best conclusion?

a. it formed from lava underground
b. it formed from compacted sediment
c. it was exposed to intense heat
d. it crystallized from magma

1. what will most likely happen to sedimentary rock buried deep underground?

a. it evaporates
b. it melts immediately
c. it becomes metamorphic rock
d. it breaks into sediment

Explanation:

Question 6

To determine why streak is more reliable than color for mineral identification:

• Option A: Color is not always inaccurate, but streak is more consistent. Eliminate A.
• Option B: Streak (the color of a mineral’s powder) is more reliable because impurities affect color but not streak as much. This matches the definition of streak.
• Option C: Streak does not measure hardness (hardness is measured by scratch tests). Eliminate C.
• Option D: Color changing with temperature is not related to streak’s reliability. Eliminate D.

To find the sequence for igneous rock to sedimentary rock:

• Option A: Melting → cooling → crystallization is igneous rock formation, not sedimentary. Eliminate A.
• Option B: Weathering breaks rocks, erosion moves sediments, deposition drops them, compaction cements them into sedimentary rock. This matches sedimentary rock formation.
• Option C: Heat → pressure → recrystallization is metamorphic rock formation. Eliminate C.
• Option D: Burial → melting → eruption is igneous rock (volcanic) formation. Eliminate D.

To identify the condition for metamorphic rock:

• Option A: Cooling lava forms igneous rock. Eliminate A.
• Option B: Deposition of sediment forms sedimentary rock. Eliminate B.
• Option C: Metamorphic rocks form from heat and pressure without melting (recrystallization of existing rocks). This is correct.
• Option D: Weathering by water is part of sedimentary rock formation. Eliminate D.

Answer:

B. Streak shows the mineral’s powdered color

Question 7