Geologic Time
How do we know what living things used to be on Earth?
Fossils
What is weathering?
Breaking down of rock
What type of boundary forms mountains?
Convergent boundary
What is the process that changes rock into sediment?
Weathering
What era are we living in now: Paleozoic, Mesozoic, or Cenozoic?
Cenozoic Era
What is erosion?
The movement of rock by wind, water, or gravity
List the layers of the Earth in order from shallowest to deepest.
Crust, mantle, outer core, inner core
What is are the 2 processes that forms sedimentary rock from sediment?
compaction and cementation
What marks the end of an era and the beginning of a new one?
A mass extinction, or major change in the life forms on Earth
What are some factors that can cause weathering?
ice wedging, plant roots, oxidation, acid rain, thermal expansion, abrasion
What type of boundary causes seafloor spreading?
Divergent boundary
How do igneous rocks form?
In a stack of rock layers, which layer is the oldest?
The deepest layer
What are some landforms that are created by erosion?
Rivers, canyons, sand dunes
What are 3 pieces of evidence for continental drift?
Fossils, landforms, shape of continents, plate movement
How do metamorphic rocks form?
Heat and pressure
Which one is a longer amount of time, an eon or an era?
Eon
What is the difference between mechanical and chemical weathering?
Pangea
Which type of rocks have crystals and/or gas bubbles?
Igneous rocks