ELEM 339

The thinnest layer of Earth's four major layers is the...

• inner core

• crust

• outcore

• mantle

The sphere that comprises all of Earth's water is the...

• hydrosphere

• geosphere

• biosphere

• atmosphere

Most geologists now believe that all the continents were once joined in a single large mass known as.....

• Eurasia

• Pangea

• Panama

• Wegenerland

The wearing down of the Earth's surface structures, loosening and breaking surfaces such as rock is known as...

• erosion

• climate

• violent weather

• weathering

What is the oldest era known in Earth's history?

• Precambrian

• Mesozoic

• Paleozoic

• Cenozoic

What is a constellation?

• a group of stars that seem to form a specific pattern when viewed from earth

• the landmass when all the continents were connected

• a dense, rapidly spinning remnant of a supernova explosion

• often thought of as vacuums that take in all that is around them

What is source that maintains our planet?

• moon

• constellations

• the milky way

• sun

About how often does the moon orbit Earth?

• 1 week

• 18 days

• 28 days

• 1 year

What planets are known as the "Gas Giants"?

• Jupiter, Saturn, Uranus, Neptune

• Mercury, Venus, Earth, Mars

• Venus, Earth, Mars, Jupiter

• Mercury, Earth, Jupiter, Pluto

Which invention helped humans see the first clear images of astronomical objects?

• Voyager

• Hubble Telescope

• Magellan

• Atlantis