Question

a river speeds up on a steep slope. predict what happens to erosion and deposition along that section and explain why. your answer which environmental factor would most likely increase the rate of chemical 1 point cold, dry climate hot, wet climate cold, wet climate hot, dry climate which type of rock is most susceptible to chemical weathering by acid 1 point rain? basalt granite limestone quartzite

Explanation:

• For the first question about the river on a steep slope: When a river speeds up on a steep slope, its kinetic energy increases. This increased energy allows the river to erode more material (by processes like abrasion, hydraulic action etc.). Deposition occurs when a river loses energy. Since the river is speeding up (gaining energy) on the steep slope, it will have less tendency to deposit sediment. So, erosion increases and deposition decreases.
• For the environmental factor question: Chemical weathering is a process where rocks are broken down by chemical reactions. Water is a key agent in many chemical weathering reactions (e.g., hydrolysis). Higher temperatures increase the rate of chemical reactions. In a hot, wet climate, there is more water available for chemical reactions (like dissolution, oxidation etc.) and higher temperatures to speed up these reactions compared to other climate options.
• For the rock - acid rain question: Limestone is mainly composed of calcium carbonate (\(CaCO_3\)). Acid rain (which contains acids like sulfuric acid \(H_2SO_4\) and nitric acid \(HNO_3\)) reacts with calcium carbonate. The reaction \(CaCO_3 + H_2SO_4=CaSO_4 + H_2O+CO_2\uparrow\) (for example) shows how limestone is chemically weathered. Basalt and granite are igneous rocks with more complex mineral compositions (like silicate minerals) that are less reactive with acid rain compared to limestone. Quartzite is a metamorphic rock made mainly of quartz (\(SiO_2\)) which is relatively inert to acid rain.

Answer:

• First question: Erosion increases and deposition decreases. The river has more kinetic energy (from speeding up) to erode, and less energy to deposit.
• Second question: Hot, wet climate.
• Third question: Limestone.