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7th Grade Spring Semester Test Review Part 2 Answer Key

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Weathering Erosion and Earth
#1 What pH is more acidic a pH of 1 or a pH of 7? 1
#2 What can cause granite, a rock that makes up landforms such as tall mountains, to break down into soil over time? exposure to plant acids
#3 What typically results from abrasion of a rock? a change in size
#4 A river starts as a steep channel in the mountains. It then leaves the mountains and enters a flatter area of land. It meanders across a plain and then enters the ocean. At which point would the river described form a delta? when the river enters the ocean
#5 A land form made by deposition at the end of a river? delta
Water
#1 What best describes how erosion by groundwater might create a land form? Slightly acidic water dissolves certain rocks underground to form a cavern.
#2 Groundwater is stored best in __________ ground. porous
#3 Water moves under Earth’s surface to fill open spaces. What is the top of this underground water called? water table
#4 What would increase the effect of erosion in a watershed? steep terrain
#5 Humans can cause different types of environmental pollution. Which type of pollution is directly caused by humans dumping the remains of dead organisms into bodies of water? biological pollution
Cycles
#1 Which of the following is a way that humans can alter the path of a river? dig a channel
#2 What will happen to the human body without air pressure? It will expand
#3 Ozone exists in Earth’s atmosphere. What is ozone? a molecule made up of three atoms of oxygen
#4 Why is the sun necessary for animals to live on Earth? Animals eat plants or other animals that eat plants, and plants convert the sun’s energy into food.
#5 What best describes how the sun is necessary for life on Earth? Its energy is converted into food that is the beginning of many food chains.
Water
#1 Which ocean zone is at the deepest location? abyssal zone
#2 Which example represents an abiotic factor in an aquatic ecosystem? The pH of a lake is decreased by acid rain.
#3 The water cycle continues because... Earth’s rotation and distance from the sun
#4 What are three processes are part of the water cycle? condensation, evaporation, precipatation
#5 What is evaporation out of plants? transpiration
Ecoregions
#1 Which of the following is a likely effect as dams and reservoirs are used to store water for urban water supply and irrigation? reduction of sediment carried by rivers to the coast
#2 What force is mainly responsible for the erosion in the hot, dry Southern High Plains of Texas? wind
#3 The Texas Blackland Prairies have very thick, fertile, marly soil. Due to this soil, what has happened to the majority of the prairies? converted to cropland
#4 The Edwards Plateau was originally covered by grasslands. Overgrazing caused this to change from grasslands to bushland. What will the decrease in plants in this area is most likely to lead to a direct increase in? erosion of soil
#5 What region would have the most caves? a plateau region
Final Question
What do humans need in space? oxygen, space suits, temperature control