The moon travels around Earth at a speed of 1km/s. Which of the following keeps the moon in orbit around the Earth?

• gravity

• magnetism

• ocean tides

• the sun's heat and light

In most places on Earth that are not near the equator, the season of summer and winter have very different characteristics. Which of the following is a common characteristic of WINTER compared to summer?

• moon and sun lower in the sky

• higher daytime temperatures

• more daily hours of sunlight

• sun rises earlier

A specific region on Earth's surface hs its highest temperature in June and its lowest temperature in December. Which of these statements explain why the temperatures are LOWEST in December?

• The region is tilted the most toward the Sun in December

• Teh region is tilted the most away from the sun in December

• This region is the farthest from the sun in December

• This region is closest to the sun in December

Sara is recording water levels in the ocean near her home once an hour for one day. She observes the water level slowly rising and falling twice that day. What is Sara observing?

• currents

• gravity

• tides

• waves

The phases of the moon are caused by the relative postions of the Earth, the sun, and the moon. Lunar phases refer to the appearance of the illuminated portion of the moon as seen by an observer on Earth. When the moon is aligned with and between Earth and the sun, which phase is happening?

• Full Moon

• New Moon

• First Quarter Moon

• Third Quarter Moon

The picture shows a tide chart from a location in Canada. What was the tidal range on June 7?

• 1.75m

• 4.04m

• 5.79m

• 7.54m

Zach is visiting Hawaii. He wants to collect seashells, and the local people tell him the best time to collect seashells is low tide. The picture shows the water level at the beach Zach is going to visit. Which of the following times would be the BEST time for Zach to collect seashells?

• 9:00 am

• noon

• 3:00 pm

• 7:00 pm

Cassie is writing a formula to show the effect of the gravitational pull of the sun and the moon on tidal range. Which formula would Cassie use to show the effect of the sun and the moon on spring tides?

• sun + moon = spring tides

• sun + Earth = spring tides

• sun- moon = spring tides

• Earth- moon = spring tides

Eclipses are predictable solar system events. The answer choices below list relative positions of Earth, the sun, and the moon. Which list represents the positions of the EArth, the sun, and the moon during a lunar eclipse?

• sun, Earth, moon

• Earth, sun, moon

• sun, moon, Earth

• moon, sun, Earth

Astronomers use cameras on Earth and in orbit to observe the solar system and other objects in space. Suppose that a camera on Earth takes a picture of a astronomical event. THe picture shows an object that is large, dark, and has a bright area immediatley around it. Which event does this picture most likely show?

• total solar eclipse

• total lunar eclipse

• waning gibbous moon

• waxing crescent moon