Question

the diagram shows an incomplete rock cycle. which rock types belong in circles 1, 2, and 3? choose the correct answer. 1. igneous 2. metamorphic 3. sedimentary; 1. metamorphic 2. igneous 3. sedimentary; 1. sedimentary 2. igneous 3. metamorphic

Explanation:

To solve this, we recall the rock cycle:

• Metamorphic rocks form from heat and pressure (so 1 should be metamorphic? Wait, no—wait, let's re - examine. Wait, the first option given: 1. metamorphic, 2. igneous, 3. sedimentary. Wait, let's think again. Wait, melting forms igneous rocks? No, melting of any rock (igneous, sedimentary, metamorphic) forms magma, which cools to form igneous rocks. Wait, the rock cycle steps:

1. Metamorphic rocks are formed by heat and pressure on other rocks.
2. Igneous rocks are formed by cooling of magma (after melting of any rock).
3. Sedimentary rocks are formed by weathering, erosion, deposition, compaction, and cementation of sediments (which come from any rock).

Looking at the diagram:

• The "Heat Pressure" arrow points to 1, so 1 is metamorphic (since heat and pressure create metamorphic rocks).
• "Melting" leads to 2, and after melting, magma cools to form igneous rocks, so 2 is igneous.
• "Weathering Erosion" leads to 3, and sedimentary rocks are formed from sediments (from weathering/erosion), so 3 is sedimentary. So the correct option is the one with 1. metamorphic, 2. igneous, 3. sedimentary.

Answer:

1. metamorphic
2. igneous
3. sedimentary (the option with these three, which is the second option in the list: "1. metamorphic, 2. igneous, 3. sedimentary")