Slow and Fast Changes on Earth

Science Chapter 6, Lessons 7 -8, pp. C 58 – C 80



Lesson 7 – Slow Changes on Land

Weathering & Erosion

Weathering

(link)

(link)

 the process that crumbles, cracks, and breaks up rocks.



Physical Weathering

o Water o __________   o __________

Chemical Weathering

o Acid rain o Rust (oxidation)

Biotic Weathering (link)

(Hint: “bio-” means life)  o ___________ & ____________

Erosion

 the process when weathered materials are carried away  ___________, __________, __________, & __________

How do people change Earth’s surface?

 Forests are cut   to make room for towns & cities to provide lumber for building materials  Wetlands, like ponds and swamps are drained  Mountains and hills are cut away  to build roads  Roads & parking lots do not let water soak into the earth. Instead it washes away.

Read pp. C 66 – C 67 to learn ways humans can help prevent unnecessary erosion.

What does Bill Nye say?



Part 1



Part 2



Part 3

Lesson 8 – Fast Changes on Land

Hurricanes, Tornadoes, Floods, Earthquakes, Volcanoes

   Do the Explore Activity on pg. C 69,

“How Do Gentle and Heavy Rains Change Earth’s Land?”

How do you think your results with the models compare to the real world?

______________________ ______________________ ______________________ ______________________ ______________________ ______________________ ______________________ ______________________  Listen to the CD for pages C 70 – 73, then match each term to its definition.

_____ hurricane A. opening in the earth’s surface _____ tornado B. sudden movement in the earth’s surface _____ flood C. Huge flow of water over usually dry land _____earthquake D. Small powerful windstorm over land _____ volcano E. violent, storm with strong winds and heavy rain

Read and discuss “A Mountain Blows Its Top” (Bright Surprises pp. 222 – 227), then label the diagram below.

ash cloud - an ash cloud is the cloud of ash that forms in the air after some volcanic eruptions. conduit - a conduit is a passage through which magma (molten rock) flows in a volcano. crust - the crust is Earth's outermost, rocky layer. lava - lava is molten rock; it usually comes out of erupting volcanoes.

magma chamber - a magma chamber contains magma (molten rock) deep within the Earth's crust. side vent - a side vent is a vent in the side of a volcano. vent - a vent is an opening in the Earth's surface through which volcanic materials erupt.

Watch “A Closer Look at Space: Earth”

(Discovery Streaming)   Play “Mindjogger” Team Members:____________________________________ ____________________________________________ ____________________________________________  Final Score  Test! Date: ___________________

*Use this packet as a study guide. See it online for youtube videos!