Question

activity a:
classifying rocks
get the gizmo ready:

• click reset.

introduction: you can classify rocks by examining characteristics such as texture. a rocks
texture is determined by the sizes, shapes, and positions of the grains that make up the rock.
goal: classify rocks as igneous, sedimentary, or metamorphic.

1. summarize: the three groups of rocks each have unique characteristics. for example,

many igneous rocks have a texture of interlocking mineral crystals. sedimentary rocks may
have distinct layers of sediments, known as strata.
to learn other characteristics of igneous, metamorphic, and sedimentary rocks, turn on
show common characteristics in the characteristics pane. in the table below,
summarize the textures that will allow you to identify and classify these rock types.

Explanation:

Igneous rocks often have a texture of interlocking mineral crystals. Sedimentary rocks may have distinct layers of sediments (strata). Metamorphic rocks commonly have a foliated (banded or layered - like due to mineral alignment under pressure) or non - foliated (more uniform without distinct banding) texture.

Answer:

Rock type	Characteristics
Sedimentary	Distinct layers of sediments (strata)
Metamorphic	Foliated (banded due to mineral alignment under pressure) or non - foliated texture