A. They happen twice a month at New Moon and Full Moon.
B. The Sun causes higher tides on Earth than the Moon does.
C. They are caused by both the Sun and the Moon.
D. They are dangerous.
C
Thông tin: The force of gravity from the Moon affects Earth. Its gravity reaches Earth and pulls the oceans toward the Moon, causing the tides. The gravity from the Sun also affects the tides. The highest tides will always occur when the Moon and Sun are aligned.
Đáp án C. They are caused by both the Sun and the Moon.
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