Our Planet Earth

Hours of daylight and darkness are exactly equal on a(n) __________ day.

equinox

Days when the Sun's light hits both hemispheres equally are called __________.

equinoxes

Which of the Earth's spheres is composed of all the water on the planet, including oceans, seas, and rivers?

hydrosphere

An organism is a __________.

living thing

To revolve means to __________.

move around another object

According to the online content article about the Sun, the Sun sustains life on Earth by __________. A. providing light, heat, and energy B. revolving around the Earth C. causing solar eruptions D. harming the Earth's biosphere

providing light, heat, and energy

Around December 21st each year, the Earth experiences a solstice. In the Northern Hemisphere, which season is it when this solstice takes place?

winter

Around June 21st each year, the Earth experiences a solstice. In the Southern Hemisphere, which season is it when this solstice takes place?

winter

The Earth completes one revolution every __________.

year

The solar system has _____ planets, and Earth is the __________ planet from the Sun.

8...third

According to the online content article about days and nights on Earth, why does the length of a day change throughout the year?

because the Earth's axis is tilted

Day and night are caused by the Earth's __________.

rotation

Days when the Earth's poles are tilted at the greatest angle away from or toward the Sun are called __________.

solstices

To rotate means to __________.

spin around in place

The tilt of the Earth's axis causes seasons. When it is wintertime in the Northern Hemisphere, which season is taking place in the Southern Hemisphere?

summer

Which of the Earth's spheres is made up of the gases and air that surround the Earth and sustain life?

the atmosphere

Which of the Earth's spheres is made up of all living things?

the biosphere

Which of the Earth's spheres is made up of the Earth's crust and the land on its surface?

the lithosphere

The Earth's orbit around the sun is elliptical. What does this word mean?

the orbit is oval-shaped

What does it mean to sustain something?

to preserve it or care for it