Mt. Rushmore
What kind of trip did Logan and his family take?
A trip across the United States
What kind of weather changed the Great Sphinx in Egypt?
Wind and sand
The heat that makes geysers comes from where?
Under Earth’s surface
What kind of rock are the arches in Arches National Park made of?
Sandstone
Why do people put fences on sand dunes?
To stop people from walking on dunes and to block wind
What are national parks?
Special places that protect nature
What is a glacier made of?
Ice
What is a volcano?
A place where melted rock comes out of the ground
What two forces shape the rocks into arches?
Wind and water
What helps hold the sand in place on dunes?
Grasses and plant roots
Mount Rushmore has faces carved into what kind of rock?
Granite
What shape are the valleys glaciers carve?
U-shaped
What makes Yosemite’s tall waterfalls flow?
Melting snow
What can happen when too much of a rock arch wears away?
It falls down
What does a jetty or wall do on a beach?
Keeps waves from washing sand away
What can happen to rock when water freezes in its cracks?
The cracks get bigger
What park is famous for the geyser called Old Faithful?
Yellowstone National Park
What is a rockslide?
Rocks falling quickly down a hill
What forms sand on beaches?
Broken rocks and seashells
What scientist helped make the first maps of the ocean floor?
Marie Tharp
Workers fill the cracks in Mount Rushmore with what material?
Silicone
What is a geyser?
A hole that shoots out hot water and steam
What can people do to help stop rockslides?
Put wire netting on loose rocks
What causes sand dunes to form?
Wind blowing sand into piles
What tool did scientists use to measure the depth of the ocean?
Sonar