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"LMS Ch 27.3

QuestionAnswer
The planets closest to the sun are called the terrestrial planets
Name the four inner planets. Mercury, Venus, Earth, and Mars
Describe the composition of the inner planets. rocky surfaces with denser cores.
What are the bowl-shaped depressions called that formed on the surfaces of inner planets when the planets collided with other objects in space? craters
Mercury, the closest planet to the sun, circles the sun every 88 days.
Mercury rotates on its axis once every 59 days.
Mercury’s surface features a long line of cliffs and a large number of craters.
The absence of a dense atmosphere and Mercury’s slow rotation contribute to a large daily temperature range.
How long is the orbital period of Venus, the second planet from the sun? 255 days
How often does Venus rotate? 243 days
The planet that Venus most resembles in mass, size, and density is. EARTH
Venus’s atmospheric pressure is about times the pressure on Earth. about 90 times the pressure on Earth
What two factors cause the high temperatures on Venus? closeness to the sun and the high concentration of carbon dioxide
What percentage of the atmosphere on Venus is composed of carbon dioxide? about 96%
What phenomenon occurs when solar energy heats Venus’s surface and the high concentration of carbon dioxide in the atmosphere blocks most of the infrared radiation from escaping? the Greenhouse Effect
Venus appears to be very bright in the night sky because drops of __________ form a cloud layer that reflects sunlight. sulfer dioxide
Why is Venus commonly referred to as the evening star or morning star? it is visible only in the early morning and late evening and appears near the sun
The surface of Venus is composed of which two types of rock? basalt and granite
the highest volcano on Venus Maat Mons
a U.S. satellite that collected data about Venus Magellan
a landform commonly found on Venus volcanoes
How could the craters on Venus be described? young craters that are not active now, but have been recently
What evidence indicates that Venus undergoes a periodic resurfacing? the age of the surface of Venus
Earth is the __________ planet from the sun. third
The orbital period of Earth is _______ days. 365
Earth completes one ________________ on its axis every day. rotation
How many moons does Earth have? one
Over the last __________________ years, Earth’s continents separated from a single landmass and drifted to their present positions. 250 million
What two factors have caused the surface of Earth to keep changing? weathering and erosion
Why is Earth the only planet on which water exists in a liquid state? the other planets water either evaporates or freezes
Mars is the _____________ planet from the sun. fourth
How long is Mars’s orbital period? 687 days
How often does Mars rotate on its axis? 24 hours
Why are Mars’s seasons similar to Earth’s? it's tilt is almost the same as the Earth
Mars is believed to have been geologically active because of its massive volcanoes and a system of deep __________________ on its surface. canyons
One of the many major volcanic regions on Mars is called Tharsis Montes
The largest volcano on Mars is _________________, which is many times the height of Mount Everest and has a base about the size of Nebraska. Olympus Mons
Why do scientists think that Martian volcanoes have grown so large? because there are no tectonic plates
Two seismic wave-producing geological events called ______________ indicate that volcanoes on Mars may still be active marsquakes
Why can water not exist as a liquid on Mars? the atmosphere is not strong enough to hold water
Which two spacecraft found evidence that liquid water once did exist on Mars’s surface? Spirit and Opportunity
Mars has many surface features that are characteristic of ______________ by water. erosion
Where might water exist as permanent frost or as a liquid on Mars? polar icecaps
Created by: tbfreema on 2009-12-06



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