Weathering The process in which rocks are FIRST broken down by chemical and/or physical mechanisms into smaller particles. There are three types of weathering: Physical Chemical Biological

Physical Weathering The physical action which breaks up rocks. Example: freeze-thaw weathering

Chemical Weathering When the rock is attacked by chemicals. Example: how acid rain breaks down limestone.

Biological Weathering Occurs when rocks are weakened and broken down by animals and plants. Example: A tree root system that is slowly splitting rocks

Erosion Erosion: the wearing away of exposed surfaces by agents such as wind, moving water and ice. This debris is moved to a new location. These agents usually contain weathered rock debris (so EROSION would come AFTER weathering occurs). Rock fall under gravity is also erosion. Deposition

Deposition Deposition is the “dropping off” of sediments after they have been eroded away (carried away)

Twig weathering twig

So… Do you think water is related back to rocks and the rock cycle? How? What do you remember from the water cycle?

What is happening in the demonstration? Link

Recall… The Water Cycle Evaporation: water from oceans, rivers, & lakes is turned into water vapor Transpiration: when water evaporates from plants Condensation: water vapor in the air is changed into liquid water. Water droplets make clouds. Precipitation: If those tiny water droplets in clouds combine with each other they grow larger, become too heavy to stay in the air, and then they fall to the ground as rain, snow, etc. Runoff: The variety of ways by which water moves across the land. Infiltration; Some of the precipitation seeps into the ground and becomes a part of the groundwater. Accumulation: The process in which water pools in large bodies (like oceans, seas and lakes). TWIG - Water Cycle

So… Do you think water is related back to rocks and the rock cycle? How? Apply: Discuss with your partner how you think the rock cycle depends on the water cycle. Be prepared to share out loud what you discussed with your partner.

Were you correct? Water is the biggest cause of erosion! Think about the grand canyon, one of the 7 natural wonders of the world. That was all caused by water cutting through the rock. Waterfalls work the same way, where the water running downhill erodes away the rock beneath. Which of the 3 rock types is most directly related to water? Sedimentary Rock… it’s formed in layers, near water sources where sediment is deposited.

Rock Cycle Simulation Lab *Group Lab* Download the “1-22 and 1-23 Starburst Lab Rock Cycle” from Jupiter Open it in Notability Take pictures when needed. Write answers in complete sentences. Wait your turn for the hot plate (one group at a time) and only use it with teacher guidance!

Think-pair-share: 1) Can rocks change type. If so, how Think-pair-share: 1) Can rocks change type? If so, how? 2) What keeps the cycle going?

Video Twig- The Rock Cycle https://twigcarolina.com/film/rock-cycles- 3239/

Let’s Review… What are the 3 classes of rock?