Which activity demonstrates chemical weathering

Rock layers A , B , C , and D are labeled. The two photographs below show dates on tombstones found in a cemetery in St. Remy, New York. The tombstones were 5 meters apart and both faced north.

Tombstone A had dates cut into the rock in Tombstone B had dates cut into the rock in Which statement best explains why the dates are more difficult to read on tombstone A than on tombstone B?

Tombstone A is composed of minerals less resistant to weathering than tombstone B. The cross section below shows sedimentary rocks being eroded by water at a waterfall. The sedimentary rock layers are being weathered and eroded at different rates primarily because the rock layers.

The photograph below shows a steep-sided rock formation that is over meters high. This landscape feature is located in an arid region. What would happen to this landscape feature if the climate became more humid? The map below shows the path of an ash cloud that resulted from the Mount St. Helens volcanic eruption. The map was developed from satellite photographs.

The path of the ash cloud was most probably determined by. A group of students observed and measured various characteristics of a stream for one day. Which statement about the stream is most likely an inference? Played 42 times. Print Share Edit Delete. Live Game Live. Finish Editing. This quiz is incomplete! To play this quiz, please finish editing it. Delete Quiz. Question 1. Which weathering process is most common in a hot, dry environment? At high elevations, which is the most common form of physical weathering?

Which activity demonstrates chemical weathering? It reacts with rocks through a process called oxidation. One example of this type of weathering is rust formation , which occurs when oxygen reacts with iron to form iron oxide rust. Rust changes the color of the rocks, plus iron oxide is much more fragile than iron, so the weathered region becomes more susceptible to breakage.

When rocks and minerals are altered by hydrolysis, acids may be produced. Acids may also be produced when water reacts with the atmosphere, so acidic water can react with rocks. The effect of acids on minerals is an example of solution weathering. Solution weathering also covers other types of chemical solutions, such as basic rather than acidic ones. One common acid is carbonic acid, a weak acid that is produced when carbon dioxide reacts with water.

Carbonation is an important process in the formation of many caves and sinkholes. Calcite in limestone dissolves under acidic conditions, leaving open spaces. Living organisms perform chemical reactions to obtain minerals from soil and rocks. Many chemical changes are possible. Lichens can have a profound effect on rock. Lichens, a combination of algae and fungi , produce a weak acid that can dissolve rock. Plant roots are also an important source of chemical weathering. As roots expand into rock, acids can change the minerals in the rock.

Plant roots also use carbon dioxide, thus changing the chemistry of the soil. New, weaker minerals are often more brittle; this makes it easier for plant roots to break up the rock. Once the rock is broken up, water can get into the cracks and oxidize or freeze. Frozen water expands, making the cracks wider and further weathering the rock.

Animals can also effect geochemistry. For example, bat guano and other animal remains contain reactive chemicals that can affect minerals. Human activities also have a major impact on rock. Mining, of course, changes the location and condition of rocks and soil. Acid rain caused by pollution can eat away at rocks and minerals. Farming changes the chemical composition of soil, mud, and rock.

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Anne Marie Helmenstine, Ph.