Question

sol snapshot - challenge yourself by answering the sol style questions below. these questions can come from 6th grade or a previous 7th - grade unit. properties of water - weathering - 6th grade science 1. physical weathering (mechanical) - water causes freeze - thaw cycles: when water seeps into cracks in rocks, freezes, expands, and eventually breaks the rock apart. flowing water in rivers or streams can abrade rocks, wearing them down into smaller pieces. 2. chemical weathering - water dissolves minerals (like salt or limestone) over time. rain water can mix with carbon dioxide in the air, forming carbonic acid, which slowly dissolves rock. this causes caves to form in areas with lots of limestone. question answer each question by circling the best answer. 1. which of the following is an example of physical weathering caused by water? a) limestone dissolving in acidic rainwater b) water freezing and expanding in rock cracks c) iron rusting when exposed to moisture d) acid rain reacting with marble 2. which process is an example of chemical weathering? a) rocks breaking apart when water freezes inside cracks b) river water carrying small pebbles downstream c) acid rain dissolving minerals in a rock d) sand blowing against a rock surface

Explanation:

1. Physical weathering is a process that breaks rocks physically without changing their chemical composition. Water freezing and expanding in rock cracks is a physical change due to the change in state of water from liquid to solid and the resulting mechanical force. Other options involve chemical reactions.
2. Chemical weathering involves a change in the chemical composition of rocks. Acid rain dissolving minerals in a rock is a chemical process as it involves a chemical reaction between the acid in the rain and the minerals.

Answer:

1. b) Water freezing and expanding in rock cracks
2. c) Acid rain dissolving minerals in a rock