Weathering
Weathering is when rocks _________________.
Break or wear down.
What do the processes of Erosion & Deposition do to rocks?
Move rocks to new locations, and drop them in new places making new landforms.
How are igneous rocks formed?
What is from magma/lava cooling.
How are sedimentary rocks formed?
Compaction and cementation.
How are metamorphic rocks formed?
heat and pressure
What are the main causes of weathering on Earth?
Wind, water/waves, ice/glaciers, and gravity.
Does the build up of deltas at the mouth of a river happen quickly or slowly?
SLOWLY!
When magma reaches the surface of the Earth (outside of the volcano), what is it called?
lava
What does the word SEDIMENT mean?
small particles of rocks
Where do metamorphic rocks form?
Lower/further down in the Earth's crust.
What is the name of the weathering process where wind blows small sediment and it scrapes against other rocks?
Abrasion
What are the small pieces of weathered rock called that get moved and dropped by erosion and deposition?
Sediment
What is super cool about some igneous 'bubbly' rocks?
They weigh almost nothing, and can float!
What makes up rocks?
Pieces of minerals!
What are the 2 kinds of weathering?
Physical (mechanical) and Chemical
What caused the Grand Canyon to form?
The weathering, erosion, and deposition from water/a river.
How does a metamorphic rock become an igneous rock?
Melting then cooling.
What are the 2 steps that make stalactites and stalagmites in caves?
Chemical weathering and deposition of minerals.
What causes large mountain valleys to form?
Erosion and deposition by glaciers/ice.
Where do igneous rocks form?
Near or under volcanoes.
Where do sedimentary rocks form?
Near or at beach/sandy areas.
What happens FASTER: the formation of a canyon, or a landslide on the side of a mountain?
Landslides happen within moments, large canyons can take hundreds of thousands of years to form!