Question

1. how are the three types of rocks, igneous, sedimentary, and metamorphic classified?

1. how do most metamorphic rocks form?

1. define convergent plate boundaries:

Explanation:

Question 8

Igneous rocks form from cooled magma/lava. Sedimentary rocks form from sediment (like sand, mud) deposition and compaction/cementation. Metamorphic rocks form from existing rocks (igneous, sedimentary, or other metamorphic) changed by heat, pressure, or chemical processes. So classification is based on their formation processes (origin: magma/lava, sediment, or metamorphism of pre - existing rocks).

Most metamorphic rocks form when pre - existing rocks (parent rocks) are subjected to high heat and pressure deep within the Earth's crust (or sometimes with chemical fluids involved). This causes physical and chemical changes to the mineral structure and texture of the parent rock. For example, shale can become slate under pressure, or limestone can become marble with heat and pressure.

Convergent plate boundaries are where two tectonic plates move towards each other. Depending on the types of plates (oceanic - oceanic, oceanic - continental, continental - continental), different geological features form. For example, oceanic - continental convergence leads to subduction (oceanic plate slides under continental plate), forming volcanoes and trenches; continental - continental convergence leads to mountain building (like the Himalayas from Indian and Eurasian plates colliding).

Answer:

The three types of rocks are classified by their formation processes: Igneous rocks form from the cooling and solidification of magma (below Earth's surface) or lava (on Earth's surface); Sedimentary rocks form from the deposition, compaction, and cementation of sediment (such as fragments of other rocks, minerals, organic matter); Metamorphic rocks form from the alteration of pre - existing rocks (igneous, sedimentary, or metamorphic) due to heat, pressure, and/or chemical processes.

Question 9