Chapter 5 lesson 1 Word Scramble

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Question	Answer
What is the chemical and physical processes that change objects on Earth's surface over time?	Weathering
What helps to break up rocks into smaller pieces over thousands of years?	Weathering
What happens during mechanical weathering?	Physical processes break up rocks into smaller pieces
Does mechanical weathering change the make up of the rock?	No
What happens to the total surface area when mechanical weathering breaks up a large rock into smaller pieces?	The total surface area of the rock increases
What holds more water and nutrients sandy or clay soil?	Clay soil holds more water and nutrients
Why does clay soil hold more water and nutrients?	Clay soil consists of smaller particles that have more surface area
What happens during ice wedging?	Water enters into cracks in rocks and freezes
What happens to water during ice wedging?	The water expands when it freezes and makes the cracks larger
What is it called when rocks grind away by friction or impact?	Abrasion
What else can cause mechanical weathering?	Plants growing in a crack or animals burrowing through loose rock
What happens during chemical weathering?	The materials that make up rocks are changed into new material
What is an important agent of chemical weathering and why?	Water and because most substances dissolve in water
What is a more powerful agent of chemical weathering-water or acid?	Acid
The measure of acidity is called what?	Ph
What do you call a ph less than 7?	Neutral
Why does rain weather rock?	Because rain is slightly acidic
What is acid rain?	Rain that contains pollutants that make its pH less than 5
What happens during oxidation?	Oxygen combines with other elements or molecules
During oxidation where does most of the oxygen come from?	The air
What is the product of oxidation?	Oxide/rust
Why are oxides useful?	They form ores which people use to obtain metals
Which part of a rock oxidizes the most because it has more contact with oxygen in the air?	The outer layer
What do mechanical and chemical weathering depend on?	Humidity and temperature
When does mechanical weathering occur the most?	In areas where the temperature changes a lot-expanding and contracting
Where does chemical weathering occur?	In areas where the climate is warm and wet
Where does weathering occur the fastest?	In regions near the equator
What affects how fast weathering occurs?	The type of rock
What determines how quickly the rock weathers?	The most easily weathered mineral

Created by: jacksterner