Explore over 4, video courses. Log in or sign up to add this lesson to a Custom Course. Correlation can involve matching an undated rock with a dated one at another location. Aa Aa Aa. Base Level of a Stream: Layers of strata are deposited horizontally, or nearly horizontally, and parallel or nearly parallel to the earth's surface.
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Paleomagnetic Dating. Figure 3: A region where lines of force move electrically charged particles, such as around a magnet, through a wire conducting an electric current, or the magnetic lines of force surrounding the earth. Earth Science Basics. The force causing materials, particularly those made of iron and other certain metals, to attract or repel each other; a property of materials that responds to the presence of a magnetic field. Cross-Cutting Relationships We follow this same idea, with a few variations, when we talk about cross-cutting relationships in rock.